A 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.22 atm. What is the molar mass of the unknown compound?

Answers

Answer 1
Using the Ideal Gas Law
PV= nRT
PV = (m/Mr) RT The molar mass of the unknown compound is : 38.0 g/mol

Mr = mRT / PV =  0.465 g x 0.08206 L * atm * K⁻¹  mol ⁻¹ x 298 K / 1.22 atm x 0.245 L = 38.0 g / mol 

everything else but G / Mol are cancelled out. 

Related Questions

How many kPa are in 2,150 mmHg?
2.83 kPa
287 kPa
1.61 ´* 104 kPa
2.18 ´* 105 kPa

Answers

To determine the pressure in units of kPa, we need to use a conversion factor to convert the units from mmHg to kPa. A conversion factor is a value that would relate two different units and is multiplied or divide to the original measurement depending on what is units is asked. From literature, 1 atm is equal to 760 mmHg and it is also equal to 101.325 kPa. We use these factors to convert the given value. We do as follows:

2150 mmHg ( 1 atm / 760 mmHg ) ( 101.325 kPa / 1 atm ) = 286.643 kPa

Therefore, the closest value from the choices is the second one which has the value of 287, this would be answer.
Final answer:

To convert 2,150 mmHg to kPa, divide by the conversion factor 7.5 mmHg, resulting in approximately 286 kPa.

Explanation:

A conversion factor is a mathematical ratio that allows you to convert from one unit of measurement to another. It is often used to change units within the same system (e.g., converting inches to centimeters) or between different systems (e.g., converting miles to kilometers) by multiplying or dividing by the appropriate factor.

To convert from millimetres of mercury (mmHg) to kilopascals (kPa), you can use the conversion factor:

1 kPa = 7.5 mmHg

First, divide 2,150 mmHg by the conversion factor:

= 2,150 mmHg / 7.5 mmHg

= 286.67 kPa

Rounding to the nearest hundredth, the answer is approximately 286 kPa.

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Which of the following has helped preserve resources while cutting the demand for energy?

A. water treated with chlorine

B. energy efficient appliances

C. landfills rather than burning waste

D. legislation against the use of chlorofluorocarbons

Answers

A is the correct answer

Answer: Option (D) is the correct answer.

Explanation:

When there is minimum use of energy and we are still able to preserve resources then it means we are cutting the demand for energy.

Therefore, when we are treating water with chlorine then it means without any electricity or energy we are cleaning the water. But at the same time chlorinated water is harmful to use unless chlorine is dissolved in limiting quantity.

Whereas energy efficient appliances will use the electricity efficiently.

Landfill will require the use of machines or man power therefore, energy will be used.

On the other hand, when rules are framed against the use of chlorofluorocarbons then there will be lesser depletion of ozone layer. Hence, use of energy will be minimum.

Thus, we can conclude that legislation against the use of chlorofluorocarbons has helped preserve resources while cutting the demand for energy.

Rewrite the following numbers in scientific notation.

Answers

1.b
2.g
3.e
4.f
5.h
6.d
7.c
8.a

What is the molarity of a 1.50 L solution containing 14 g of HCl

Answers

Hey there !

Molar mass HCl = 1 + 35.5 => 36.5 g/mol

* Number of moles :

n = m / mm

n = 14 / 36.5

n = 0.383 moles of HCl

Therefore :

M = n / V

M = 0.383 / 1.50

 = 0.255 M

hope this helps!

To sterilize a 50.0-g glass baby bottle, we must raise its temperature from 22.0ºc to 95.0ºc . how much heat transfer is required?

Answers

To sterilize the said baby bottle we have to raise the temperature from 22.0 degrees Celsius to 65 degrees Celsius and in order to determine the amount of heat that has to be supplied, we need the heat that would be absorbed by the baby bottle. First, we need to know the material of that baby bottle which, for this case, is made up of glass since we need the specific heat capacity of the material wherein for glass it is equal to 0.84 J / g C. We determine the heat as follows:

Heat absorbed = Heat to be supplied = Heat transferred m C (T2 - T1)
Heat transferred = 50.0 g (0.84 J/ g C) (95 C - 22 C) = 3066 J

An acid has an acid dissociation constant of 2.8x10^-9. What is the base dissociation constant of its conjugate base?
2.8x 10^-23
3.6x10^-6
2.8x10^5
3.6 x10^22

Answers

pH=-lg[H⁺]
pH=-lg(2.8×10⁻⁹)=8.553

pOH=14-pH
pOH=14-8.553=5.447

[OH⁻]=10^(-pOH)
[OH⁻]=10⁻⁵·⁴⁴⁷=3.6×10⁻⁶

Answer: The correct answer is [tex]3.6\times 10^{-6}[/tex]

Explanation:

We are given:

Acid dissociation constant [tex](k_a)=2.8\times 10^{-9}[/tex]

Water dissociation constant [tex](k_w)=1\times 10^{-14}[/tex]

To calculate the base dissociation constant for the conjugate base, we use the equation:

[tex]k_w=k_a\times k_b[/tex]

where,

[tex]k_b[/tex] = base dissociation constant

Putting values in above equation, we get:

[tex]10^{-14}=2.8\times 10^-9}\times k_b\\\\k_b=3.6\times 10^{-6}[/tex]

Hence, the correct answer is [tex]3.6\times 10^{-6}[/tex]

In aqueous solution, globules of up to several thousand amphiphilic molecules arranged with the hydrophilic groups on the surface and the hydrophobic groups buried in the center are called _____.

Answers

The answer to this question is the "Micelles" such as in an aqueous solution, globules of up to several thousand amphiphilic arranged with the hydrophilic groups on the surface and the hydrophobic groups buried in the center or in the middle are commonly called as MICELLES. These micelles is the aggregate or collection of molecules in the solution such as we have observed in the detergent.

soaps feel slippery on our hands because they dissolve the oil on our skin, decreasing friction. this is because soap contains

Answers

because the oily part of its molecule tends to lay up against solid surfaces, but without much in the way of areas of electric charge that would cause it to stick more firmly to that surface.

Soaps are made by the process saponification. Soaps contains long chain fatty acids and glycerol. The oily nature of soaps are due the presence of fatty acids.

What is saponification?

Saponification is the process, making of soaps from glycerol and fatty acids. Therea are different types of soaps based on the ionic nature of the long chain fatty acids.

There are alkaline soaps in which the acidic chain possess a negatively charged group and acidic soaps are those bearing positively charged ions. The nature of sopas can be varied as per the use also.

Fatty acids are long chain hydrocarbons formed by the combination of simple hydrocarbons and they will reacts easily with alcohols forming esters of fatty acids that are soaps.

Hence, the presence of fatty acids make the soaps oily in nature and move gains friction in our hand.

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A sample of hydrogen gas was collected over water at 21ºc and 685 mmhg. the volume of the container was 7.80 l. calculate the mass of h2(g) collected. (vapor pressure of water = 18.6 mmhg at 21c.)

Answers

Final answer:

The mass of H2(g) collected is approximately calculated as 0.582 grams. This result is found by subtracting the water's vapor pressure from the total pressure, applying the ideal gas law to find the number of moles, and converting moles to grams.

Explanation:

To calculate the mass of H2(g) collected, we'll first need to calculate the pressure of the dry hydrogen gas. The pressure of a gas collected over water is a sum of the pressure of the dry gas and the vapor pressure of the water. Hence, the pressure of dry H2(g) is the total pressure minus the water vapor pressure, so 685 mmHg - 18.6 mmHg = 666.4 mmHg.

Next, we convert this pressure into atmospheres: 666.4 mmHg * (1 atm / 760 mmHg) = 0.877 atm (approximately). We'll also need to convert the temperature to Kelvin: 21ºC + 273 = 294 K.

Then, we can use the ideal gas law, PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant (0.0821 L*atm/K*mol), and T is temperature. Solving for n, n = PV / RT, we substitute the known values to get n = (0.877 atm * 7.80 L) / (0.0821 L*atm/K*mol * 294 K) = 0.291 mol.

Last, we turn moles of H2 into grams. As the molar mass of H2(g) is approximately 2 g/mol, the mass of H2(g) collected is 0.291 mol * 2 g/mol = 0.582 grams.

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How does electronegativity cause the polarity in water and, ultimately, enable water to form hydrogen bonds between other water molecules?

Answers

Oxygen is more electronegative than Hydrogen 
                                  So . . . 
When the two form covalent bonds, oxygen pulls the electrons closer and farther from hydrogen
                                   So . . .
The water molecule is polar, with oxygen more negative and hydrogen more positive.
                                   So . . .
Since opposites attract, the more negative oxygens attract the more positive hydrogens of other water molecules, forming the hydrogen bonds.

Electronegativity in water creates partial charges, causing polarity. This polarity allows hydrogen bonding between water molecules, enhancing interactions.

In a water molecule (H₂O), oxygen is more electronegative than hydrogen. This means that oxygen attracts the shared electrons in the O-H bonds more strongly than hydrogen does.

As a result, the electrons spend more time closer to the oxygen atom, giving it a partial negative charge (δ−), while the hydrogen atoms acquire a partial positive charge (δ+). This uneven distribution of charge creates a dipole moment, making water a polar molecule.

The polarity of water molecules causes them to be attracted to each other. The partial positive charge of one water molecule is attracted to the partial negative charge of another, forming hydrogen bonds.

These bonds are relatively weak compared to covalent bonds but are crucial for water’s unique properties, such as its high boiling point and surface tension.

What formula can be used to calculate [H30+]?

A. [H3O+] = log(OH-)
B. [H3O+] = 1 x 10 [-OH-]
C. [H3O+] = antilog(–pH)
D. [H3O+] = [H3O+][ OH-]

Answers

I think the correct answer is option C. The formula that can be used to determine the concentration of hydronium ions, [H3O+],  would be [H3O+] = antilog(–pH). This is from the expression of pH which is a measure that is used for the acidity of a certain solution based on the hydronium ion concentration in the solution. It is expressed as pH = -log [H3O+]. Manipulating the equation so that [H3O+] is left on one side would lead us to the same expression as given in option C.

pH = -log [H3O+]
-pH = log [H3O+]
10^-pH = 10^log [H3O+]
10^-pH = [H3O+]

where 10^x is the same as antilog of x.

[H3O+] = antilog (-pH)

What would be the formula of the precipitate that forms when pb(no3)2 (aq) and k2so4 (aq) are mixed? pbk2 pbso4 h2o none of the above k(no3)2?

Answers

The formula of the precipitate that will be formed is PbSO4.
When lead ll nitrate react with potassium sulphate, one of the product formed is lead sulphate. The reaction is a double decomposition precipitation reaction; PbSO4 is the precipitate formed. 

Answer:

[tex]\rm PbSO_4[/tex] will precipitate in the given reaction.

Explanation:

The reaction takes place between lead nitrate [tex]\rm Pb(NO_3)_2[/tex] and potassium sulphate [tex]\rm K_2SO_4[/tex].

Now, the reaction will be a double displacement reaction in which the ions will exchange between lead nitrate [tex]\rm Pb(NO_3)_2[/tex] and potassium sulphate [tex]\rm K_2SO_4[/tex].

So, the chemical reaction can be written as,

[tex]\rm {Pb(NO_3)_2+K_2SO_4}\rightarrow PbSO_4+2KNO_3[/tex]

In the above equation, [tex]\rm PbSO_4[/tex] is a precipitate which will be settled down in the  bottom and [tex]\rm KNO_3[/tex] will form an aqueous solution.

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How are monosaccharides different from disaccharides?

Answers

Saccharides are sugars or carbohydrates

The prefix mono means one
The prefix di means 2
Monosaccharides are 1 basic carbohydrate molecule
Disaccharides are 2 basic carbohydrate molecule

Crash course biology has a great video on this that explains the biological significance of proteins lipids carbohydrates and the nucleic acids
 
hope this helps


What is the Celsius temperature of 1 mole of a gas that has an average kinetic energy of 4,265 joules?

69°C

96°C

369°C

435°C

Answers

96°C If I'm not mistaking

Answer:

Explanation:

Kinetic energy is the energy possessed by an object by virtue of its motion.

Average kinetic energy is defined as the average of the kinetic energies of all the particles present in a system. It is determined by the equation:

[tex]K=\frac{3nRT}{2}[/tex]

K= kinetic energy

n= number of moles

R= gas constant

T= temperature  

[tex]4265J=\frac{3\times 1\times\times 8.314\times T}{2}[/tex]

[tex]T=342K[/tex]

[tex]tK=(t-273)^0C[/tex]

[tex]T=342K=(342-273)^0C=69^0C[/tex]

Thus temperature will be [tex]69^0C[/tex]

When atoms of two or more elements are chemically bonded the substance formed is a?

Answers

it is called a compound

CH4(g) + H2O(g) mc004-1.jpg CO(g) + 3H2(g) What will happen to the equilibrium of this reaction if CO is added to the system?

Answers

Equilibrium shifts to the left.

The decomposition of methanol, ch3oh(g), to form ch4(g) and o2(g) absorbs 252.8 kj of heat per mole of oxygen formed. write a balanced thermochemical equation for this reaction.

Answers

The thermochemical equation is the chemical equation including the net change of enthalpy (heat).

The chemical equation for the decomposition of methanol to form methane and oxygen is:

2CH3OH --> 2CH4 + O2

The thermochemical equation is:

2CH3OH ---> 2CH4 + O2  - 252.8 kJ

Note that the heat is placed as negative at the right side because it is absorbed during the decomposition, so the environment will have 252.8 kJ less per each mole of O2 produced.

You can equivalently write:

2CH3OH + 252.8 kJ --> 2CH4 + O2
Final answer:

The balanced thermochemical equation for the decomposition of methanol (CH3OH(g)) to form CH4(g) and O2(g) is CH3OH(g) -> CH4(g) + O2(g) + 252.8 kJ/mol of O2 formed.

Explanation:

The balanced thermochemical equation for the decomposition of methanol (CH3OH(g)) to form CH4(g) and O2(g) can be written as:

CH3OH(g) -> CH4(g) + O2(g) + 252.8 kJ/mol of O2 formed.

Determine whether or not each mixture is a buffer. check all that apply. check all that apply. koh and nh3 hbr and nacl hcl and hbr hcho2 and nacho2

Answers

A buffer is usually composed of either:
- a weak base combined with its conjugate acid, or
- a weak acid combined with its conjugate base

Now, examining each of the choices:
1- KOH and NH3: since they are both bases, thus this mixture is not a buffer
2- HBr and NaCl: since HBr is a strong acid while NaCl is the salt of another different acid, thus this mixture is not a buffer
3- HCl and HBr: these are both considered to be strong acid, thus this mixture is not a buffer
4- HCHO2 and NaCHO2: as for HCH02, it is considered a weak base while NaCHO2 is considered its conjugate base, thus this mixture is a buffer

Final answer:

HCHO2 and NaCHO2, and CH3NH2 and CH3NH3Cl can make buffer solutions. HCl and NaCl, and NH3 and NaOH cannot make buffer solutions.

Explanation:

1. HCHO2 is formic acid, a weak acid, while NaCHO2 is the salt made from the anion of the weak acid (the formate ion [CHO2]). The combination of these two solutes would make a buffer solution.

2. HCl is a strong acid, not a weak acid, so the combination of these two solutes would not make a buffer solution.

3. CH3NH2 is methylamine, which is like NH3 with one of its H atoms substituted with a CH3 group. Because it is not listed in Table 12.8.1, we can assume that it is a weak base. The compound CH3NH3Cl is a salt made from that weak base, so the combination of these two solutes would make a buffer solution.

4. NH3 is a weak base, but NaOH is a strong base. The combination of these two solutes would not make a buffer solution.

Calculate the freezing point and melting point of a solution containing 10.0g of naphthalene

Answers

The freezing point of the solution is 0.88°C

The melting point of a substance which is also the same as the freezing point is the temperature at which it changes from a solid state to a liquid state at a specific pressure. At the melting point, the substance absorbs heat energy, increasing its temperature and causing the solid structure to break down

We have that;

Number of moles of naphthalene = 10 g/128 g/mol

= 0.078 moles

Mass of benzene = Density * volume

= 0.877 g/cm3 * 100.0 mL

= 87.7 g or 0.0877 Kg

Where;

ΔT = K m i

ΔT = 5.12 *  0.078 moles/ 0.0877 Kg * 1

= 4.6°C

ΔT = Freezing point of pure solvent - Freezing point of solution

Freezing point of solution = 5.48°C - 4.6°C

= 0.88°C

Missing parts

Calculate the freezing point and melting point of a solution containing 10.0 g of naphthalene (C10H8) in 100.0 mL of benzene. Benzene has a density of 0.877 g/cm3

Explain and give examples of theories and laws (big bang molecular clock etc.)

Answers

1. Schrodinger's Cat- A many world's theory that describes quantum coherence and phenomenon. 
2. Newton's 1st Law- says that objects in rest will stay in rest and objects in motion will stay in motion. The most important lesson here is that an object in rest may not be in rest position.
3. Ohms law- says the current passing through an area is directly proportional to the voltage

Calculate the total percentage of oxygen in magnesium nitrate crystals, Mg(NO3)2.6H2O

Answers

Lets solve this puzzle with following formula:

(6.21×10^3)(0.1050)

(Scientific Notation)

Answers

6.21 x 10^3 = (Move decimal point 3 spaces to the right)

6210

6210 (0.1050)

652.05


Question 3(Multiple Choice Worth 2 points)

A 20 gram piece of metal is added to a sample of 100 grams of water inside a calorimeter. If the metal is at a temperature of -5° Celsius and the water is at 20° Celsius, which of the following best describes what will occur inside the calorimeter?

The final temperature of the water will be 15° Celsius.
The energy gained by the metal equals the energy lost by the water.
The final temperature of the water will be higher than the initial temperature.
The temperature lost by the water will equal the temperature gained by the metal.

Answers

The energy gained by the metal equals the energy lost by the water...
It is phrased this way because the focus is on the energy entering the system, more than it leaving the surroundings.

This is a problem based on concept of first law of thermodynamics

if a body is giving heat it will be absorbed by some other body or surrounding.

Now we have taken metal at low temperature and water at high temperature

So water will lose some energy and the same amount of energy will be gained by metal. The exchange will continue untill both reach the same temperature.

So answer is

The energy gained by the metal equals the energy lost by the water.

Which describes the volume of 1 mol of gas at standard temperature and pressure? The volume is greater for a larger mass of gas.
The volume is the same for any gas.
The volume depends on the size of the container.
The volume varies with the pressure.

Answers

I think the correct answer would be the second option. The volume of 1 mol of gas at standard temperature and pressure would be the same for any gas. If and only if the gas is an ideal gas. This is according to the ideal gas law ( PV = nRT ), at STP ( P = 1 atm T = 273.15 K ) you would calculate the volume of the gas to be 22.4 L. So, 1 mol of any ideal gas would occupy 22.4 L of volume. We calculate as follows:

PV = nRT
V = nRT / P
V = (1 mol ) (0.08205 L-atm / mol K) (273.15 K ) / 1 atm
V = 22.4 L 

How many subshells are there in the shell with n = 6?

Answers

The number of subshells within a certain shell can be identified using the orbital angular momentum quantum number "l"

"l" is given values from zero till (n-1)
So, for n=6
l is given the following values: 0,1,2,3,4,5
Counting the number of subshells, we will find that the shell with n=6 has 6 subshells

Answer:

5 subshells

Explanation:

The light intensity of a source is 100 candelas. The illuminance on a surface is 4 lux. How far is the surface from the source?

A. 7 meters
B. 6 meters
C. 4 meters
D. 5 meters

Answers

The correct answer is D. 5 meters.
Answer : Option D) 5 metersExplanation :

To find the luminous intensity this formula is used;

Luminous intensity = illuminance ×  [tex]radius ^{2}[/tex]

∴ Lv = Ev × [tex] r^{2}[/tex]

We know the luminous intensity is 100 candelas and the illuminance is 4 lux.

∴ 100 = 4 x  [tex] r^{2}[/tex]

∴ 100/4 =  [tex] r^{2}[/tex]

∴ 25 =  [tex] r^{2}[/tex]

∴ r =√25 = 5 meters

Therefore, the surface will be at a distance of 5 meters from the source.

1. When an ionic bond forms between magnesium (Mg) and bromine (Br), which of the following occurs?

A. Mg loses one electron. 
B. Mg loses two electrons.
C. Mg gains two electrons. 
D. Mg and Br share electrons.

2. Which of the following must occur in order for an ionic bond to form?

A. Two ions must be close enough to each other to share electrons. 
B. Uncharged atoms must remain electrically neutral and combine.
C. Two ions must belong to the same group to be attracted to each other. 
D. An atom that gains electrons must be attracted to an atom that loses electrons.

Answers

The correct answers are:

1. B. Mg loses two electrons.

When Mg and Br combine, 2 atoms of Br attaches itself to Mg. The chemical reaction is:

Mg + Br ---> MgBr2

Since Br is more electronegative than Mg, then Mg loses an electron per Br therefore losing 2 electrons.

 

2. D. An atom that gains electrons must be attracted to an atom that loses electrons.

An ionic bond is formed when one molecule is more electronegative than the other molecule which results in gaining and losing of electrons. The more electronegative molecule gains electron while the less electronegative loses electron.

Final answer:

In the formation of an ionic bond between magnesium and bromine, magnesium loses two electrons to become a Mg₂ + ion, and these oppositely charged ions attract each other to form the bond.

Explanation:

Understanding Ionic Bonds between Magnesium and Bromine:

1. When an ionic bond forms between magnesium (Mg) and bromine (Br), the process involves a transfer of electrons. Specifically, Mg loses two electrons (Option B) to achieve a stable electron configuration similar to the nearest noble gas. As a result, magnesium becomes a Mg₂+ ion.

2. For an ionic bond to form, there must be a transfer of electrons from one atom to another, leading to the formation of ions with opposite charges, which are then attracted to each other (Option D). An atom with a lower electronegativity, like magnesium, will lose electrons and become a positively charged cation. Conversely, an atom with higher electronegativity will gain electrons and become a negatively charged anion, such as bromine becoming Br-.

If 4.0 g of hydrogen and 10.0 g of oxygen are mixed according to the equation 2 h2 + o2 → 2 h2o, which is the limiting reagent?

Answers

From the equation, we can see that the molar ratio between hydrogen and oxygen is:
2 : 1

Next, we determine the moles of hydrogen and oxygen that are actually present using:
moles = mass / Mr

Hydrogen:
moles = 4 / 2 = 2

Oxygen:
10/32 = 0.3125

Therefore, it is evident that the moles of oxygen present, 0.3125, are less than those that are required for 2 moles of hydrogen, which is 1. This makes oxygen the limiting reactant, which is the one that limits the completion of a reaction.

Final answer:

To find the limiting reagent between hydrogen and oxygen, we convert their masses to moles and use the stoichiometry of the balanced chemical reaction 2 H2 + O2 → 2 H2O. Oxygen is the limiting reagent because there are not enough moles of O2 to fully react with the available moles of H2.

Explanation:

To determine the limiting reagent when 4.0 g of hydrogen (H2) and 10.0 g of oxygen (O2) are mixed to react according to the equation 2 H2 + O2 → 2 H2O, we need to perform mass-mole calculations for both reactants and compare the stoichiometry of the balanced equation.

First, convert the mass of each reactant to moles:

For H2: Molecular weight is approximately 2.02 g/mol. Thus, 4.0 g H2 ÷ 2.02 g/mol = 1.98 moles of H2.

For O2: Molecular weight is approximately 32.00 g/mol. Thus, 10.0 g O2 ÷ 32.00 g/mol = 0.3125 moles of O2.

According to the balanced equation, 2 moles of H2 react with 1 mole of O2. Therefore, to fully react with 1.98 moles of H2, we would need 0.99 moles of O2. However, we only have 0.3125 moles of O2, which is insufficient to react with all the H2. Therefore, O2 is the limiting reagent.

The principal ingredient of glass is ______________________.

Answers

The principal ingredient of glass is quartz sand (SiO₂).

What is true about the solution process involved in an instant cold pack?



The process is endothermic and has a negative enthalpy of solution.

The process is exothermic and has a negative enthalpy of solution.

The process is endothermic and has a positive enthalpy of solution.

The process is exothermic and has a positive enthalpy of solution.

Answers

the third one : endothermic with a positive enthalpy

Answer:

c

Explanation:

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