Passage III
Gas effusion occurs when a gas moves through a tiny opening into a region of lower pressure. The rate in milliliters per second (mL/sec) is measured using the apparatus in Figure 1.
A 25 mL gas sample in a syringe freely escapes into a flask. The molecular mass, in a.m.u. (atomic mass units), for seven gases and the time required to completely effuse are recorded in Table 1. The densities (mass/volume) in grams per liter (g/L) and average molecular speed (average distance traveled by a molecule per second) in meters per second (m/sec) are also given.
Figure 2 shows a graph of the effusion rate versus the molecular mass of the gases.
14. Given the information in Table 1, the difference in effusion times is greatest between which of the following pairs of gases?
Your Answer is
Correct Answer is H
Explanation
Look at table 1 according to the topic, find out the difference in the efffusion time of each option, and find that the difference in H option is the largest at 13.2 seconds, so choose H