Question 1

At STP, what is the volume occupied by 2.00 moles of an ideal gas?

Accepted Answer

$$44.8\ \mathrm{L}$$

Question 2

Which of the following is the correct value for the molar volume of an ideal gas at STP?

Accepted Answer

$$22.4\ \mathrm{L}$$

Question 3

A sample of oxygen gas has a measured volume of $$125\ \mathrm{mL} at $$STP. How many grams are present? $$(M_{O_2$} = 32.00\ \mathrm{g/mol})$$

Accepted Answer

$$0.178\ \mathrm{g}$$

Question 4

Which equation is used to calculate the volume of one mole of an ideal gas at STP?

Accepted Answer

$$V = \frac{nRT}{P}$$

Question 5

A sample of dichloromethane gas $$(CH_2Cl_2)$$ occupies $$32.6\ \mathrm{L} at$$ $$310\ \mathrm{K}$$ and $$5.30\ \mathrm{atm}. $$What is its volume at STP?

Accepted Answer

$$52.0\ \mathrm{L}$$

Question 6

Which gas sample has the greatest volume at STP: $$10.0\ \mathrm{g} He$$, $$10.0\ \mathrm{g} Ne$$, or $$10.0\ \mathrm{g} O$_2$$?

Accepted Answer

All have the same volume

Question 7

Nitrogen and hydrogen combine to form ammonia via the reaction: $$N_2 + 3H_2$$ \rightarrow 2NH_3$$. What mass of nitrogen is required to completely react with 8.00$$\ \mathrm{L}$$ H_2$ at STP?

Accepted Answer

$$1.01\ \mathrm{g}$$

Question 8

If you have $$44.8\ \mathrm{L} of CO$_2$$ gas at STP, how many molecules are present?

Accepted Answer

$$2.69 	imes 10$$^{24}$$

Question 9

Which of the following best describes STP conditions?

Accepted Answer

$$0^\circ \mathrm{C}$$, $$1.00\ \mathrm{atm}$$

Question 10

How many moles of chlorine gas occupy a volume of $$15.7\ \mathrm{L} at $$STP?

Accepted Answer

$$0.701\ \mathrm{mol}$$

Question 11

A gas occupies $$10.0\ \mathrm{L} at $$STP. If the temperature is doubled and the pressure is halved, what is the new volume?

Accepted Answer

$$40.0\ \mathrm{L}$$

Question 12

Which of the following is the correct value for the gas constant $$R$$ when using liters, atmospheres, moles, and Kelvin?

Accepted Answer

$$0.08206\ \mathrm{L\ atm\ $$mol^{-1}$$\ K$$^{-1}$$}$$

Gases: Standard Temperature and Pressure (STP) and Molar Volume

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