Passage I

The molar volume of a gas is the volume occupied by 1 mole (mol; 6 × 1023 atoms or molecules) of that gas at a given pressure and temperature.

Table 1 shows how the molar volume, in L, of each of 6 gases—helium (He), neon (Ne), argon (Ar), hydrogen (H2), nitrogen (N2), and oxygen (O2)一varies with pressure, in atmospheres (atm), at a temperature of 273 Kelvins (K).

Table 2 shows how the molar volume of each of the 6 gases varies with temperature at a pressure of 1.00 atm.

5. In a gas sample, collisions between gas particles are common. The average time a gas particle spends between one collision and the next is called the mean free time. In general, mean free time decreases as a sample's volume decreases. Based on Table 1, the mean free time would be least for a 1 mol sample of which gas at which pressure?

Answer and Explanation

Your Answer is

Correct Answer is D

Explanation

In the question, it is pointed out that if the volume is small, the mean free time will be small, so as long as you find out the four options, the smallest volume is the answer