Marsha can cook 5 cakes or 10 pizzas in an hour Howard can cook 3 cakes or 12 pizzas in a hour. Which items should each person specialize in

Final answer:

To find the mass of methanol, divide the number of molecules by Avogadro's number to get moles, then multiply by molar mass. The mass of 9.79 × 10²⁴ molecules of methanol is 520.64 grams.

Explanation:

To calculate the mass of 9.79 × 10²⁴ molecules of methanol (CH₃OH), first, we need to determine how many moles of methanol there are. Since 1 mole of any substance contains 6.02 × 10²³ molecules (Avogadro's number), we can use this to find the number of moles:

Moles of methanol =
9.79 × 10²⁴ molecules / 6.02 × 10²³ molecules/mol

This calculation reveals that there are 16.27 moles of methanol. Next, we use the molar mass of methanol, which is 32.0 g/mol, to find the mass:

Mass of methanol = 16.27 moles × 32.0 g/mol = 520.64 grams. Therefore, 9.79 × 10²⁴ molecules of methanol have a mass of 520.64 grams.

Answer:

The correct answer is class I explosives.

Explanation:

An explosive refers to a chemical, which leads to a sudden, almost immediate discharge of gas, pressure, and heat when exposed to sudden pressure, shock, or high temperature. These are unstable substances and are primarily of two kinds.  

The type one comprises of substances possessing the tendency of undergoing supersonic reactions, like TNT and nitroglycerin. The other kind comprises substances, which burn briskly, however, at a subsonic rate. The examples are rocket propellants, gunpowder, and fireworks.  

First we assume that the compound containing only C,H,and O is combusted completely in the presence of excess oxygen, so that the only things that can be produced are water and carbon dioxide.

From there we should back calculate the amount of Hydrogen that is in the original sample by taking all of the hydrogen in the 0.239g to came from the organic compound.

And since we know that the original mass of the sample was .100g, we can also easily get a mass % H by taking the mass Hydrogen calculated over the total original mass (.100 g)

So that:

0.239g H2O / (18.01 g/mol) = .01327 moles H20

.01327 Moles H20 * 2.02g H (per every mole H2O) = .0268g H initially present in the sample

.0268g H / .100g sample = 26.8% H by mass

The mass percent of hydrogen in the 0.1 g sample of compound containing carbon–hydrogen–oxygen is 26.6%

We'll begin by calculating the mass of the hydrogen in the compound. This can be obtained as follow:

Molar mass of H₂O = (2×1) + 16 = 18 g/mol

Molar mass of H₂ = 2 × 1 = 2 g/mol

Mass H₂O produced = 0.239 g

Mass of H = [tex]\frac{2}{18} * 0.239[/tex]

Finally, we shall determine the mass percent of Hydrogen in the compound. This can be obtained as follow:

Mass of H = 0.0266 g

Mass of compound = 0.1

[tex]Percentage = \frac{mass}{mass of compound} * 100\\\\= \frac{0.0266}{0.1} * 100[/tex]

Thus, the mass percent of hydrogen in the sample is 26.6%

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Final answer:

Thallium, being the heaviest member of Group 13, will have the largest number of electron shells, which makes its atomic radius the largest of the group.

Explanation:

The element in Group 3A (13) with the largest atomic size is thallium, which has the symbol Tl. Atomic size generally increases from top to bottom within a group on the periodic table due to the addition of electron shells.

Thallium, being the heaviest member of Group 13, will have the largest number of electron shells, which makes its atomic radius the largest of the group.

The element with the largest atomic size in Group 3A (13) is thallium (Tl), as atomic size increases down a group.

Answer: The correct answer is Option D.

Explanation: Organic compounds are defined as the compounds which have hydrogen and carbon atoms in it. They are also known as hydrocarbons.

From the given options:

Option 1: [tex]Ca_3(PO_4)_2\text{ and }CO_2[/tex] are not organic compounds because these two compounds do not contain hydrogen element in it.

Option 2: [tex]CaCl_2\text{ and }CaCN_2[/tex] are not organic compounds because these two compounds do not contain hydrogen and carbon elements in it.

Option 3: [tex]CaSO_4[/tex] is not an organic compound because this compound do not contain hydrogen and carbon elements in it.

Option 4: All the compounds contain hydrogen and carbon elements in it and hence, all the compounds are organic compounds.

Therefore, the correct option is Option D.

Zinc has a molar mass of about 65.38 g/mol. So we calculate the number of moles first:

moles Zinc = 8.93 g / (65.38 g/mol) = 0.1366 mol

We can calculate for the number of atoms using Avogadros number.

atoms Zinc = 0.1366 mol * 6.022 x 10^23 atoms / mol

atoms Zinc = 8.23 x 10^22 atoms

Final answer:

Ions are created when neutral atoms either lose or gain electrons, forming cations and anions, respectively. The periodic table helps predict the charges of ions depending on their group, where alkali metals form +1 cations, alkaline earth metals form +2 cations, and halogens form -1 anions. The formation of ionic compounds involves the combination of these oppositely charged ions to achieve electrical neutrality.

Explanation:

Ions are formed when atoms gain or lose electrons. When a neutral atom loses one or more electrons from its valence shell, it becomes a cation (a positive ion). Conversely, when it gains one or more electrons in its valence shell, it becomes an anion (a negative ion).

Charges of Ions and Ionic Compounds:

The periodic table can be a tool for predicting the charges of many ions based on their group. For instance, alkali metals form +1 ions, while alkaline earth metals form +2 ions. Halogens typically form -1 ions. Ionic compounds consist of these positive and negative ions in a ratio that balances their total charges, resulting in an electrically neutral compound.

Electron Configurations and Ion Charges:

It's important to note that ions only form through the movement of electrons, not protons. For elements within the same group on the periodic table, the number of valence electrons determines the common ion charge. Elements will either reach a stable electron configuration by losing or gaining electrons to form ions.

Iki also known as Lugol's solution, is an indicator used to test for the presence of starch. Benedict's reagent is used to test for the presence of reducing sugars, such as glucose and fructose

Lugol's solution is a yellow-brown solution that turns blue-black in the presence of starch.

Benedict's reagent is a clear blue solution that changes color to green, yellow, orange, or red, depending on the amount of reducing sugar present. Benedict's test is commonly used in the laboratory to detect the presence of reducing sugars in various substances.

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The solubility of carbon dioxide in water at 25 °C increases from 0.0351 m at 785 torr to approximately 0.0675 m at 1510 torr.

The solubility of a gas in a liquid is described by Henry's Law, which states that at a constant temperature, the solubility of a gas in a liquid is directly proportional to the pressure of the gas above the liquid.

Using this law, we can calculate the solubility of carbon dioxide (CO₂) in water at a different pressure while keeping the temperature constant at 25 °C.

At 785 torr, the solubility of CO₂ is 0.0351 m. According to Henry's Law, the solubility (S) can be calculated using the formula S₁/P₁ = S₂/P₂, where S₁ and S₂ are the solubilities at pressures P₁ and P₂, respectively.

If the pressure is increased to 1510 torr, we can find the new solubility (S₂) as follows:

S₂ = S₁ x (P₂/P₁)
= 0.0351 m x (1510 torr / 785 torr)
= 0.0351 m x (1510/785)
= 0.0351 m x 1.9235671
= 0.067533 m (approx)

The solubility of CO₂ at 25 °C and 1510 torr is approximately 0.0675 m.

First let us get the molecular mass of the compound C2H5O.

C has molar mass of 12 amu, H is 1 amu, while O is 16 amu, therefore:

C2H5O = 12 amu * 2 + 1 amu * 5 + 16 amu = 45 amu

So to get 90 amu, simply double all the elements, therefore:

C4H10O2

Let us assume that the given formula of elements is empirical formula where elements have simplest whole number ratio

The empirical mass =  2 X atomic mass of carbon + 5 X atomic mass of hydrogen + at mass of O

The empirical mass = 2 X 12 + 5 + 16 = 45

The ratio of molecular mass and empirical mass = 90 / 45 = 2

Molecular formula is obtained by multiplying the empirical formula with this ratio / factor

molecular formula = 2 X (C2H5O) = C4H10O2

Chemical weathering and the formation of biochemical sediment remove carbon from the atmosphere by releasing carbon dioxide through the breakdown of rocks. This carbon dioxide can then be stored in the geosphere as biochemical sediments.

Chemical weathering and the formation of biochemical sediment play a crucial role in removing carbon from the atmosphere and storing it in the geosphere. Chemical weathering refers to the breakdown of rocks and minerals through chemical reactions, which releases carbon dioxide into the atmosphere. This carbon dioxide can then be dissolved in water and can react with other compounds to form biochemical sediments, such as calcium carbonate. These sediments eventually become part of the geosphere, storing carbon for long periods of time.

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The density of soft drink A is indeed 0.35 g/ml.

Given:

Mass of the soft drink (including sugar) = 110 g

The volume of the soft drink = 100 ml

Mass of sugar = 75 g

First, we need to find the mass of just the liquid (excluding the sugar), then we can calculate the density.

Mass of liquid = Total mass of soft drink - Mass of sugar

= 110  - 75

= 35 g

Now we can calculate the density:

Density = Mass ÷ Volume

Density = 35 ÷ 100

Density = 0.35 g/ml

The density of soft drink A is indeed 0.35 g/ml.

The reaction is limited by the amount of Lithium available. With the given amount of Lithium and Nitrogen gas, the maximum amount of Li3N that could be produced is 4.726 moles.

The question is looking for the maximum amount of Li3N that can be produced from given amounts of Li and N2. According to the chemical equation 6 Li + N2 → 2 Li3N, six moles of Li react with one mole of N2 to produce two moles of Li3N. Hence, the Li:N2:Li3N mole ratio is 6:1:2. If you have 14.18 moles of Li and 16.37 moles of N2, the reaction is limited by Li because it would require 16.37 moles of N2 to entirely consume 98.22 moles of Li (16.37 moles * 6). But since you only have 14.18 moles of Li, this will limit the formation of Li3N. Therefore, the maximum amount of Li3N that could be produced is 2/6 * 14.18 moles, which equals to 4.726 moles of Li3N.

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Final answer:

The respiratory and renal systems are crucial in maintaining the acid-base balance of blood, by managing the levels of CO2 and bicarbonate, respectively.

Explanation:

The two body systems that contribute to the acid-base balance of blood are the respiratory system and the renal or excretory system. The primary blood buffer system is carbonic acid/hydrogen carbonate, which aids in maintaining the blood pH within a narrow range. The respiratory system regulates blood pH by exhaling carbon dioxide (CO2), while the renal system adjusts blood pH through the excretion of hydrogen ions (H+) and the conservation of bicarbonate (HCO3-). These two systems play a vital role in the acid-base homeostasis by removing excess acids or bases from the body.

Answer:

Explanation:

Acetaldehyde is a colorless, volatile liquid with a pungent and suffocating smell. It is produced as a result of the oxidation of ethyl alcohol to acid or acetic fermentation. Its formula is: CH3CHO formula.

Acetaldehyde occurs naturally in alcoholic beverages. In excess, however, it resembles the smell and taste of an immature green apple.

Fermentation is a process that degrades molecules to transform them into other simpler molecules.

The most frequent causes for which the impurity of acetaldehyde can be generated in fermentation:

Ans: 7.50% of P

Given:

Mass of NPK sample = 100 g

Mass of P in sample = 7.5 g

To determine:

The % P in the given sample

Explanation:

The percent of a particular substance (say,X) in a given total amount (M) is generally expressed as:

% X = [Mass of X/Total mass]*100

In this case:

%P = [mass of P/mass of NPK sample]*100

    = [7.5/100]*100 = 7.5%