Q: Standard Temperature and Pressure (STP) is defined as:

$$0^\circ\mathrm{C}$$ ($$273.15\ \mathrm{K}$$) \,\text{and}\, 1\ \mathrm{atm}$

Question 1

Which of the following best describes a vapor?

Accepted Answer

A substance in the gaseous state that is normally a liquid or solid at room temperature.

Question 2

Which of the following is NOT a characteristic property of gases?

Accepted Answer

Gases have definite volume.

Question 3

Pressure is defined as:

Accepted Answer

The force exerted per unit area.

Question 4

Which of the following is NOT a commonly used unit of pressure?

Accepted Answer

$$\mathrm{mol}$$

Question 5

Which four variables are important for defining the state of a gas?

Accepted Answer

Pressure, volume, temperature, and amount (moles)

Question 6

A medical oxygen tank contains $$5.0\ \mathrm{L} of$$ $$O_2 at$$ $$150\ \mathrm{atm}$$ and $$25^\circ\mathrm{C}. If $$the gas is released into a room at $$1.0\ \mathrm{atm}$$ and $$25^\circ\mathrm{C}$$, what will be the final volume of $$O_2$$? (Assume ideal gas behavior.)

Accepted Answer

$$750\ \mathrm{L}$$

Question 7

Which of the following is a correct statement of Boyle's Law?

Accepted Answer

$$P_1V_1 = P_2V_2 (at $$constant $$T$$ and $$n)$$

Question 8

A balloon is filled with $$2.0\ \mathrm{L} of $$air at $$25^\circ\mathrm{C}. If $$the temperature increases to $$50^\circ\mathrm{C} at $$constant pressure, what is the new volume? (Use Charles's Law.)

Accepted Answer

$$2.17\ \mathrm{L}$$

Question 9

Which of the following is Avogadro's Law?

Accepted Answer

Equal volumes of gases at the same temperature and pressure contain equal numbers of molecules.

Question 10

Which of the following is the value of the ideal gas constant $$R in SI $$units?

Accepted Answer

$$8.314\ \mathrm{J\ $$mol^{-1}$$\ K$$^{-1}$$}$$

Question 11

Standard Temperature and Pressure (STP) is defined as:

Accepted Answer

$$0^\circ\mathrm{C}$$ ($$273.15\ \mathrm{K}$$) \,	ext{and}\, 1\ \mathrm{atm}$

Question 12

Which equation represents the combined gas law?

Accepted Answer

$$\dfrac{P_1V_1}{T_1$} = \dfrac{P_2V_2}{T_2$}$$

Question 13

Dalton's Law of Partial Pressures states:

Accepted Answer

The total pressure of a mixture of gases is equal to the sum of the partial pressures of each component.

Question 14

A mixture contains $$2.0\ \mathrm{mol} of$$ $$N_2$$ and $$3.0\ \mathrm{mol} of$$ $$O_2. $$What is the mole fraction of $$O_2$$?

Accepted Answer

$$0.60$$

Question 15

Which of the following is NOT an assumption of the kinetic molecular theory (KMT) for ideal gases?

Accepted Answer

Gas particles exert attractive forces on each other.

Question 16

Which statement correctly describes the difference between diffusion and effusion?

Accepted Answer

Diffusion is the mixing of gases, while effusion is the escape of gas through a small hole.

Question 17

Which condition would most likely cause a real gas to deviate from ideal behavior?

Accepted Answer

High pressure and low temperature

Question 18

A $$1.0\ \mathrm{L}$$ container holds $$0.5\ \mathrm{mol} of$$ $$He$$ gas at $$300\ \mathrm{K}. $$What is the pressure inside the container? (Use $$R = 0.0821\ \mathrm{L\ atm\ $$mol^{-1}$$\ K$$^{-1}$$})$$

Accepted Answer

$$12.3\ \mathrm{atm}$$

Question 19

Which of the following best explains why gases are compressible?

Accepted Answer

Gas particles are far apart relative to their size.

Study Guide: Properties and Laws of Gases in General Chemistry

Study Guide - Practice Questions

Study Guide - Flashcards