A certain element forms an ion with 36 electrons and a charge of +2. identify the element

Answers

Answer 1
The answer is Strontium or Sr

Hoep this helps
Answer 2

Answer: The element is Strontium.

Explanation:

Atomic number is defined as the number of electrons or number of protons that are present in an element.

Atomic number = Number of protons = Number of electrons

If an element has a positive charge, it means that the electrons are lost which were earlier present.

Thus, the total number of electrons in the given element becomes = 36 + 2 = 38

And the element which has 38 electrons means that it has an atomic number of 38.

Hence, the element is Strontium.


Related Questions

Bubbling chlorine gas into colorless potassium bromide solution produces a dark red solution. what is being reduced?

Answers

The CHLORINE GAS IS REDUCED WHILE THE BROMINE IONS IN POTASSIUM BROMIDE ARE OXIDIZED.
When chlorine gas is bubble through a solution of potassium bromide, it will replace bromine in the compound because it is more reactive than bromine. During this process, the atoms of the chlorine gas will be reduced while the bromine ions in the compound will be oxidized.

What structural feature of lecithin allows it to behave like an emulsifying agent?

Answers

Lecithin is an emulsifier agent that's composed of 5 smaller molecules: phosphoric acid, choline, glycerol( is the backbone), and two fatty acids. 

The fatty acids, which are hydrophobic (afraid of water), makes this substance more similiar to fats and represent the non-polar part of the lecithin.
The phosphate group is the polar portion of the molecule and it's the negatively charged. The choline is positively charged, which readily dissolve in water.

Lecithin is a good emulsifier because of these structural features. the hydrophobic contacts with the oil, while the hydrophilic end contacts with the water.

"what is the difference between a physical change and a chemical change? give an example of both and explain your answer. what are the three physical states of matter?"

Answers

CHEM 1021 CHAPTER 1 (8 th Edition) MATTER, ENERGY, AND MEASUREMENT AND APPENDIX I AND II Note: This is an optional study guide. This study is not an exhaustive list of questions that could appear on quizzes or exams. These are sample questions that may or may not be used on a quiz or midterm exam or final exam. Other questions that are not found on this study guide will be on actual quizzes, midterm and final exams. It is important to do all ofthe homework problems that are in your Chem 1021 lecture text in addition to thequestions in this study guide. Make sure that you do all of the Chemical Connections homework questions that have assigned. Learn the basic principles and then be prepared to apply the principles to problems that you have not seen before. The following questions are to be answered from CHEM 1021 CHAPTER 1 (8 th Edition) ANDAPPENDIX I AND II LECTURE TEXT, LECTURE NOTES AND LECTURE SLIDES. 1. What is matter? 2. What is chemistry? 3. What is the difference between a physical change and a chemical change? Give an example of both and explain your answer. 4. What is the difference between a physical change and a chemical change? Give an example of both and explain your answer. What are the three physical states of matter? 5. What is the difference between a physical property and a chemical property? Give an example of both and explain your answer.6. What is the scientific method? What are the basic components of the scientific method? 7. What are the differences between a hypothesis, theory

True or false: Driving a motor vehicle after taking substances which alter The central nervous system can have side effects which include impaired attention reaction time and vision

Answers

True, because the substance basically reacts to the nervous system just like the anesthetic. Which can affect your decision making, and you might experience drowsiness, slow reaction time which is very risky for the driver and his/her surroundings.

Hope this helps :)

Lesson 04.01: Chemical vs. Physical Changes and Properties Define and identify chemical and physical properties and changes. Give examples of physical and chemical properties and changes. Compare and contrast chemical and physical properties and changes.

Answers

A chemical property and a physical property are related to chemical and physical changes of matter.

Answer: physical property is an aspect of the matter that can be observed or measured without changing it. Examples of physical properties include color, molecular weight, and volume.

chemical property may only be observed by changing the chemical identity of a substance.

This property measures the potential for undergoing a chemical change. Examples of chemical properties include reactivity, flammability and oxidation states.


Answer:

A chemical property and a physical property are related to chemical and physical changes of matter.

Answer: A physical property is an aspect of the matter that can be observed or measured without changing it. Examples of physical properties include color, molecular weight, and volume.

A chemical property may only be observed by changing the chemical identity of a substance.

This property measures the potential for undergoing a chemical change. Examples of chemical properties include reactivity, flammability and oxidation states.

Explanation:

which subatomic particle has a negative charge?
A) proton
B) electron
C) neutron
D) all particles

Answers

Considering the structure of the atom, The subatomic particle that has a negative charge is the electron (option B)

Structure of the atom

All atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them.

Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged (electrons).

In other words, every atom consists of:

Protons: are positively charged particles and are located in the nucleus of the atom.Neutrons: are uncharged particles and have a mass size similar to protons. They are located in the nucleus of the atom.Electrons: have a negative charge equal to 1 and have negligible mass. They move around the nucleus at different energy levels.

Finally, an electron has a negative charge.

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Final answer:

The subatomic particle that has a negative charge is the electron.

Explanation:

The subatomic particle that has a negative charge is the electron.

Electrons are tiny particles found outside the nucleus of an atom. They have a negative charge and are responsible for the flow of electricity. Protons, on the other hand, have a positive charge, and neutrons have no charge.

In summary, the answer to your question is the electron.

69 whenever organic matter is decomposed under oxygen-free(anaerobic) conditions, methane is one of the products. thus,enormous deposits of natural gas, which is almost entirelymethane, exist as a major source of fuel for home and industry.(a) it is estimated that known sources of natural gas can produce5600 ej of energy (1 ej  10 18 j). current total global energyusage is 4.0  10 2 ej per year. find the mass (in kg) of knownsources of natural gas (  h ° rxn for the combustion of ch 4  802 kj/mol)

Answers

The solution is as follows:

The problem would only need the information of 5,600 EJ for the known sources of methane. The molar mass of methane is 16 g/mol.

802 kJ/mol(1000 J/ 1 kJ)(1 mol/16 g)(1000 g/1 kg)(x kg) = 5,600 EJ(10¹⁸ J/1 EJ)
Solving for x,
x = 1.18×10¹⁴ kg of natural gas or methane

When compared to sulfuric acid, how strong are carboxylic acids?

Answers

Carboxylic acids are weaker than sulphuric acids, the Ka or the acid ionization constant measured for this is less than 1, indicating that the reaction will proceed in both the forward and reverse directions.

How many moles of nitrogen, N, are in 88.0 g of nitrous oxide, N2O?

Answers

Number of moles ( of N20) = mass / molar mass = 88.0g / 44.01g/mole = 2 moles So, there's 2 moles of N20, and in every molecule there's 2 nitrogen atoms -> there's 4 moles of nitrogen in 88.0g of N20
Final answer:

To find the number of moles of nitrogen, N, in 88.0 g of nitrous oxide, N2O, we can use the molar mass of N2O. The molar mass of N2O is calculated by adding the atomic masses of nitrogen and oxygen. Using the equation number of moles = mass (g) / molar mass (g/mol), we can calculate that there are 2.0 moles of nitrogen, N, in 88.0 g of N2O.

Explanation:

To find the number of moles of nitrogen, N, in 88.0 g of nitrous oxide, N2O, we need to use the molar mass of N2O. The molar mass of N2O is calculated by adding the atomic masses of nitrogen and oxygen: 2(14.01 g) + 16.00 g = 44.02 g/mol. Now, we can use the molar mass to calculate the number of moles:

Number of moles = Mass (g) / Molar mass (g/mol)

Number of moles = 88.0 g / 44.02 g/mol = 2.0 mol of nitrogen, N.

which two structures would provide a positive identification of a plant cell under a microscope

Answers

lysosome, central vacuole
chloroplast, large central vacuole

How many neutrons does element X have if its atomic number is 45 and its mass number is 156?

Answers

Each atom has three atomic particles, which are electron, neutron and proton. The number of proton an atom has determines its atomic number. For an atom to be neutral, the number of proton and electron must be equal.
Mass number is defined as the summation of proton and neutron in an atom.
For the question given above, the number of proton is 45, because the atomic number is 45 and the number of electron too is 45.
To find the number of neutron; Mass number = proton + neutron
Neutron number = Mass number - proton number
Neutron number = 156 - 45 = 111.
Therefore the number of neutron in element X is 111.

what are the 4 indicators that a chemical reaction has taken place?what are they

Answers

color change, production of a gas, formation of a precipitate, odor

The 4 indicators that a chemical reaction has taken place are:

A change in color, temperature, formation of a precipitate and evolution of a gas.

There are four main indicators that a chemical reaction has taken place:

1. A change in color: This is the most common indicator of a chemical reaction. When two substances react, they often produce new substances with different colors. For example, when iron rusts, it changes from a shiny silver color to a dull orange color.

2. A change in temperature: Some chemical reactions release heat, while others absorb heat. If you notice a change in temperature, it's a good indication that a chemical reaction has taken place. For example, when you mix baking soda and vinegar, the reaction releases heat, and the mixture will become warm.

3. The formation of a precipitate: A precipitate is a solid that forms when two liquids are mixed. If you see a solid forming in a solution, it's a good indication that a chemical reaction has taken place. For example, when you mix silver nitrate and sodium chloride, a white precipitate of silver chloride will form.

4. The evolution of a gas: Some chemical reactions produce gases. If you see bubbles forming in a solution, it's a good indication that a gas is being produced. For example, when you mix baking soda and vinegar, carbon dioxide gas is produced, and you will see bubbles forming in the solution.

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Write the ground state electron configuration of w using the noble-gas shorthand notation.

Answers

Tungsten (W) has an atomic number 74
The nearest noble gas to tungsten in the periodic table is Xe which has atomic number of 54.

Therefore, the configuration of W using the noble gas Xe will be as follows:
[Xe] 4f14 5d4 6s2

Tungsten contains 74  electrons in total. The electronic configuration of tungsten can be written as [Xe] 4F¹⁴ 5d⁴ 6s².

What is tungsten?

Tungsten is 74th element in periodic table. It is a d -block element and is classified as a transition metal. Tungsten have potential application in electronic devices. The filaments of electric bulb are made by tungsten.The latin name of tungsten is wolfram. That's why it has the symbol W.

Noble gases have completely filled orbitals and their electronic configuration is fully filled in all orbitals. Therefore, using the noble gas notation we can represent the configuration of other elements.

Tungsten have 74 electrons. Xenon a noble gas have 54 electrons . Thus all the orbitals are completely filled. W can be written using Xe. Thus remaining 20 electrons have to specified in corresponding orbitals. Hence, the configuration of W is [Xe] 4F¹⁴ 5d⁴ 6s².

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It takes 26.8 mL of a 0.0700 M NaOH standard solution to neutralize a 250 mL sample of lactic acid (C3H6O3). What mass of lactic acid was dissolved in the sample?

Answers

The complete balanced chemical reaction for this would be:

NaOH  +  C3H6O3  -->  NaC3H5O3  +  H2O

 

So we see that exactly 1 mole of NaOH reacts with 1 mole of lactic acid.

Calculate moles of NaOH.

moles NaOH = 0.07 moles/L * 0.0268 L

moles NaOH = 1.876 x 10^-3 mol

 

So,

moles C3H6O3 = 1.876 x 10^-3 mol

The molar mass of lactic acid is 90.08 g/mol so the mass is:

mass C3H6O3 = (1.876 x 10^-3 mol) * 90.08 g/mol

mass C3H6O3 = 0.169 g

Butane (C4H10) is used as a fuel where natural gas is not available. How many grams of butane will fill a 3.50-liter container at 35.6 °C and 758 torr? I've put the values through n = PV/RT to get n = 0.0138 and then converted to grams to get 0.77423g but it's not the right answer on my practice midterm. Any help is gratefully appreciated!

Answers

We use the formula PV = nRT. P = 758 torr = 0.997 atm. V = 3.50 L. T = 35.6 C = 308.15 K. R = 0.0821. Rearranging the equation gives up n = PV/Rt and we get .0138 moles of butane. Mass of 0.0138 moles of butane = .0138 x 58.12 = 8.02g.

Which of these molecules are polar? check all that apply. co2 so2 ch2cl2 pcl3?

Answers

Polar molecules are molecules with net dipole due to the presence of partial positive and partial negative charge. For example, water is a polar molecule that has partial positive and partial negative charge on it. CO2 is a non polar compound.

Answer: The following molecules are polar:
SO2- It is polar because it has dipole moment.
CH2Cl2
PCl3

In the given question, the molecules that are polar are [tex]\rm SO_2[/tex] and [tex]\rm CH_2Cl_2[/tex]. The correct answer is option 2 and option 3, respectively.

A molecule is a chemical entity that is formed by two or more elements, which are chemically bonded together.

A molecule is polar if it has a net dipole moment, which means that the electron distribution is not symmetrical around the molecule.

- [tex]\rm SO_2[/tex] is a bent molecule with a sulfur atom bonded to two oxygen atoms. The sulfur-oxygen bonds are polar due to the electronegativity difference between sulfur and oxygen. The molecule is not symmetrical, and the partial charges do not cancel out, so  [tex]\rm SO_2[/tex] is polar.

- [tex]\rm CH_2Cl_2[/tex] is a tetrahedral molecule with a carbon atom bonded to two hydrogen atoms and two chlorine atoms. The carbon-hydrogen bonds are nonpolar, but the carbon-chlorine bonds are polar. The molecule is not symmetrical, and the partial charges do not cancel out, so  [tex]\rm CH_2Cl_2[/tex] is polar.

Therefore, [tex]\rm SO_2[/tex] and [tex]\rm CH_2Cl_2[/tex] are the molecules that are polar and [tex]\rm CO_2[/tex] and [tex]\rm PCl_3[/tex] are nonpolar. Option 2 and 3 are the correct answer, respectively.

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Calculate the number of moles of caco3 (calcium carbonate, or limestone) in a 20.0g sample of this substance

Answers

First calculate for the molar mass of the given formula unit, CaCO₃. This can be done by adding up the product when the number of atom is multiplied to its individual molar mass as shown below.

     molar mass of CaCO₃ = (1 mol Ca)(40 g Ca/mol Ca) + (1 mol C)(12 g of C/1 mol of C) + (3 mols of O)(16 g O/1 mol O) = 100 g/mol of CaCO₃

Then, divide the given amount of substance by the calculated molar mass.
            number of moles = (20 g)(1 mol of CaCO₃/100 g)
             number of moles = 0.2 moles of CaCO₃

Answer: 0.2 moles

Final answer:

To find the number of moles of calcium carbonate in a 20.0g sample, divide the mass of the sample by the molar mass of CaCO3, which is approximately 100.09 g/mol. The calculation shows there are about 0.1998 moles in the sample.

Explanation:

To calculate the number of moles of calcium carbonate (CaCO3) in a 20.0g sample, we use the molar mass of CaCO3. The molar mass of CaCO3, which is the mass of one mole of calcium carbonate, is the sum of the atomic masses of one calcium (Ca), one carbon (C), and three oxygen (O) atoms.

That gives us a molar mass of approximately 40.08 (Ca) + 12.01 (C) + 3 × 16.00 (O) = 100.09 grams per mole.

To find the number of moles, we divide the mass of our sample by the molar mass:

Number of moles = Mass of sample ÷ Molar mass

For a 20.0g sample:

Number of moles of CaCO3 = 20.0 g ÷ 100.09 g/mol = 0.1998 moles

Therefore, there are 0.1998 moles of calcium carbonate in a 20.0g sample of limestone.

If a “universal solvent” could dissolve anything, what problems might you imagine that would cause in everyday life?

Answers

People call water a 'universal solvent' because it is capable of dissolving more substances than any other liquid. I think it could can be a major problem if every substance was readily soluble by water or any solvent. If so, it would mean that there is nothing that could contain water if it was not completely saturated with another solute. All in all, the idea of a universal solvent would be just impossible to imagine.

Final answer:

A hypothetical universal solvent that could dissolve anything would lead to significant practical and biological problems, as it would destroy containers and structures, potentially leading to chaos. Water is often termed the 'universal solvent' because of its ability to dissolve many substances, crucial for life processes; however, it cannot dissolve nonpolar substances like oils.

Explanation:

If a “universal solvent” could dissolve anything, it would pose significant challenges in everyday life. Such a solvent would not differentiate between materials, making it impossible to contain or store it as it would dissolve any container. Furthermore, the structural integrity of everything around us, including our own bodies, relies on the stability of materials not dissolving or breaking down on contact with solvents. Therefore, a true universal solvent could potentially dissolve buildings, roads, and other infrastructure. Our own cells, which require a water-based solution to keep the necessary biochemical reactions occurring, would also be unable to maintain their structure, leading to life-threatening situations.

Water is often described as the “universal solvent” because it dissolves more substances than any other liquid. However, this label is a relative term because while water is excellent at dissolving a wide range of substances due to its polarity and ability to form hydrogen bonds, it cannot dissolve nonpolar substances like oils. Water's solvent properties are essential for life; it dissolves vital nutrients and minerals, facilitates chemical reactions in the body, and allows for the transport of substances in biological systems.

How many kilocalories are involved in the production of 33.68 g of NH3?

Answers

I believe that the balanced chemical equation is:

3H2(g)+N2(g)→2NH3(g), ΔH = -21.9 kcal

 

We can see that 21.9 kcal of heat is released for every 2 moles of NH3.

The molar mass of NH3 is 17 g/mol, hence:

moles NH3 = 33.68 g / (17 g/mol)

moles NH3 = 1.98 mol

 

The total energy released is:

total heat = (-21.9 kcal / 2 mol) * 1.98 mol

total heat = -21.70 kcal

Which of these is a compound?

A. Steel

B.Sugar

C.Air

D.Nitrogen

Answers

Sugar is a compound made of carbon, hydrogen and oxygen.

Answer: The correct option is B.

Explanation:

An element is the simplest substance which cannot be divided further and is made up from only one type of atoms. Example: oxygen, nitrogen etc.

A compound is defined as a substance which is formed by the combination of two or more elements in a fixed ratio. Example: [tex]CO_2,H_2O[/tex] etc.

A mixture is formed by the combination of elements or compounds in a non-uniform ratio. Example: Salt in water

Option A: Steel is a alloy of 96% iron, carbon and many other elements. This is a homogeneous mixture of more than 2 elements. Hence, it is considered as a mixture because elements are not present in a fixed ratio.

Option B: Formula for sugar is [tex]C_{12}H_{22}O_{11}[/tex]. This is a compound made from the elements: Carbon, Hydrogen and Oxygen in a fixed ratio of 12 : 22: 11. Hence, it is considered as a compound.

Option C: Air is a mixture of many gases. Gases present in air are nitrogen, oxygen, argon , carbon dioxide etc. These gases are not present in fixed ratio.

Option D: Nitrogen is the simplest unit of substance. It is considered as an element.

Hence, the correct option is B.

Explain why an anion exchange resin can be used to separate a mixture of cations

Answers

it separates the mixture beacause the aroma in the live resin seapartes the mixes of bactira and fungis like yeast and euthiria bacteria cells

Temperature measures _____.

Answers

Celsius (C)
Farenheit (F)
Kelvin (K)

hope this helps

How many copper atoms are in this amount of copper?

Answers

which amount of copper?
your question seems incomplete
What amount of copper??

Anyways my global history teacher is named mr. Copper , I hate that $@"&!?.

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If your front lawn is 25.0 feet wide and 20.0 feet long, and each square foot of lawn accumulates 1150 new snow flakes every minute, how much snow (in kilograms) accumulates on your lawn per hour? Assume an average snow flake has a mass of 1.90 mg.

Pleas explain the steps you used.

Answers

25.0 x 20.0 equals 500 square feet
1150 x 60 = 69000
69000 x 500 = 34500000
34500000 x 1.90 mg = 65550000 mg
65550000 mg= 65.55 kilograms

Which molecule has a central atom that uses the set of hybrid orbitals shown below to form bonds with the non-central atoms?

Answers

# lp = ½[ (valence e⁻ of A )- n(A:X σ bonds;2 perO) ±charge ] 
ICl2-: ½[ (7 valence e⁻ of I )- 2(I:Cl σ bonds;) +1(-ve charge) ] =3lp = AX2E3 sp3d hybridization 
H2O: ½[ (6 valence e⁻ of O)- n(O:H σ bonds ] = 2lp AX2E2 sp^3 
CO2: O=C=O C sp 
NO2-: ½[ (5 valence e⁻ of N )- 4(2 O) +1] =1lp AX2E sp^2 hybridization 
The figure you have in your pic is of sp^3 hybridization (four lobes) so answer is H2O
Final answer:

The type of hybridization a central atom exhibits is determined by the number of regions of electron density around it. For example, molecules with a lone pair on the central atom or those with two single bonds and a double bond to the central atom display sp² hybridization. Central atoms surrounded by two regions of valence electron density depict sp hybridization.

Explanation:

The type of hybridization a molecule exhibits depends on the number of regions of electron density that surround its central atom. Molecules with a lone pair on the central atom or those with two single bonds and a double bond to the central atom, show sp² hybridization. Examples of such molecules include CINO, formaldehyde (CH₂O), and ethene (H₂CCH₂). Furthermore, central atoms surrounded by just two regions of valence electron density present sp hybridization, found in molecules like HgCl₂, Zn(CH3)2, HCCH, and CO₂. The geometry of these regions of electron density mirrors the shapes of molecules predicted by the VSEPR theory, further indicating how hybrid orbital theory provides an explanation for these molecular shapes.

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(b) what is the major product of the reaction at very low temperatures?

Answers

The reaction is low b/c of  the tempature. that's why.

Which element does the electron configuration 1s22s22p2 represent ?

Answers

1s2 2s2 2p2 represents carbon, element #6. The electron configuration contains 2 in each shell listed.

Answer:

The element is Carbon. Atomic number = 6

Explanation:

The electron configuration distributes electrons into levels or sub-levels, Each of these levels has a determined capacity of electrons that can contain and you always follow an specific order given to you by the Linus Diagram.

Sub Level s--> 2 electrones

Sub level p --> 6 electrons

Sub level d --> 10 electrons

Sub level f --> 14 electrons

Sub level g --> 18 electrons.

Considering this you must follow the arrows of the Linus Diagram and distribute all the electrons acording to the atomic number of the element.

Zn is less active than mg write the equations decribing what occurs when you mix, zn with o.5 m magnesium chloride, mgcl2 if no reaction occurs write n.r

Answers

Final answer:

Zinc (Zn) does not react with magnesium chloride (MgCl₂) because Zn is less reactive than Mg and cannot displace Mg from its compound. The answer to the student's query is - no reaction (N.R).

Explanation:

When considering the reactivity of zinc (Zn) relative to magnesium (Mg), we refer to the activity series of metals. According to the activity series, Mg is more reactive than Zn, which means that Mg is more likely to lose electrons compared to Zn. When mixing Zn metal with a solution of magnesium chloride (MgCl₂), we are essentially testing whether Zn can replace Mg in MgCl₂. However, since Zn is less reactive than Mg, it cannot displace Mg from its compound. The reaction we're investigating would be:

Zn (s) + MgCl₂ (0.5 M) → N.R (no reaction)

No reaction will occur in this case, so we denote this by writing 'N.R' to signify that a reaction does not take place.

Suppose 4 moles of a react with excess amount of b to produce 382.5 g of c, calculate the percent yield of
c. (the molar mass of c is 310.2 g/mol)

Answers

To find the percent yield, we first need to write this out as an equation: 3A + 2B --> C + 6D. The moles of C equals 1/3 times the moles of A. Therefore, the moles of C equals 4/3. The theoretical yield equals = moles x molar mass of C. (4/3) x (310.2) = 413.6g The percent yield equals actual yield/theoretical yield x 100%. 382.5g/413.6g x 100% = 92.48%

What mass of limestone (in kg) would be required to completely neutralize a 15.5 billion-liter lake that is 1.7×10^−5 M in H2SO4 and 8.9×10^−6 M in HNO3?

Answers

 

The complete balanced chemical reactions are:

HNO3 =>          CaCO3 + 2HNO3 → Ca(NO3)2 + H2O + CO2(g)

H2SO4 =>         CaCO3 + H2SO4 → CaSO4 + H2O + CO2(g)

 

So we see that 1 mole of CaCO3 is needed for 2 moles of HNO3 and similarly to 1 mole of H2SO4.
The number of moles can be calculated as the product of volume and molarity, so:

 

moles H2SO4 = 1.7×10^−5 M * (15.5 x 10^9 L) = 263,500 mol H2SO4

moles HNO3 = 8.9×10^−6 M * (15.5 x 10^9 L) = 137,950 mol HNO3

 

So the total moles of CaCO3 required is:

moles CaCO3 = 263,500 mol * 1 + 137,950 mol * (1/2)

moles CaCO3 = 332,475 mol

 

The molar mass of CaCO3 is 100.086 g/mol, so the mass is:

mass CaCO3 = 332,475 mol * 100.086 g/mol

mass CaCO3 = 33,276,092.85 g = 33.3 x 10^3 kg

Mass of limestone required for complete neutralization is 3,336.64 [tex]\rm \times\;10^4[/tex] grams.

Limestone is [tex]\rm CaCO_3[/tex]. The neutralization reaction for limestone will be:

[tex]\rm CaCO_3\;+\;2\;HNO_3\;\rightarrow\;Ca(NO_3)_2\;+\;H_2O\;+\;CO_2[/tex]

[tex]\rm CaCO_3\;+\;H_2SO_4\;\rightarrow\;CaSO_4\;+\;H_2O\;+\;CO_2[/tex]

The balanced equation states that for neutralization of 1 mole of limestone, 2 moles [tex]\rm HNO_3[/tex] and 1 mole of [tex]\rm H_2SO_4[/tex] is required.

The moles of [tex]\rm HNO_3[/tex] and [tex]\rm H_2SO_4[/tex] available are:

Moles of [tex]\rm HNO_3[/tex] = molarity [tex]\times[/tex] volume (L)

Moles of [tex]\rm HNO_3[/tex] = 8.9 [tex]\rm \times\;10^-^6[/tex] [tex]\times[/tex] 15.5 [tex]\rm \times\;10^9[/tex] L

Moles of [tex]\rm HNO_3[/tex] = 13.975 [tex]\rm \times\;10^4[/tex] moles

Moles of [tex]\rm H_2SO_4[/tex] = 1.7 [tex]\rm \times\;10^-^5[/tex]  [tex]\times[/tex] 15.5 [tex]\rm \times\;10^9[/tex] L

Moles of [tex]\rm H_2SO_4[/tex] = 26.35  [tex]\rm \times\;10^4[/tex] moles

Moles of [tex]\rm CaCO_3[/tex] required = 1 mole of [tex]\rm H_2SO_4[/tex] + [tex]\rm \dfrac{1}{2}[/tex] moles of [tex]\rm HNO_3[/tex]

Moles of [tex]\rm CaCO_3[/tex] required = 26.35  [tex]\rm \times\;10^4[/tex] moles [tex]\rm H_2SO_4[/tex] + [tex]\rm \dfrac{1}{2}[/tex] (13.975 [tex]\rm \times\;10^4[/tex] moles) [tex]\rm HNO_3[/tex]

Moles of [tex]\rm CaCO_3[/tex] required = 26.35  [tex]\rm \times\;10^4[/tex] + 6.9875  [tex]\rm \times\;10^4[/tex]

Moles of [tex]\rm CaCO_3[/tex] required = 33.3375  [tex]\rm \times\;10^4[/tex] moles

Mass of limestone = moles of limestone [tex]\times[/tex] molecular weight of limestone

Mass of limestone =  33.3375  [tex]\rm \times\;10^4[/tex] moles [tex]\times[/tex] 100.0869 grams

Mass of limestone = 3,336.64 [tex]\rm \times\;10^4[/tex] grams.

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 So the total moles of CaCO3 required is:

moles CaCO3 = 263,500 mol * 1 + 137,950 mol * (1/2)

moles CaCO3 = 332,475 mol

 

The molar mass of CaCO3 is 100.086 g/mol, so the mass is:

mass CaCO3 = 332,475 mol * 100.086 g/mol

mass CaCO3 = 33,276,092.85 g = 33.3 x 10^3 kg

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