One mole of an ideal gas is heated at constant volume from 300 K to 600 K
CHEMISTRY · Single correct · A Level · Chemistry · Thermodynamics · Thermodynamics
Problem
One mole of an ideal gas is heated at constant volume from 300 K to 600 K. Which statement best explains why the entropy of the gas increases during this process?
(a) The entropy remains unchanged because, for an ideal gas, entropy depends only on volume, which is constant.
(b) The average kinetic energy of the gas decreases, allowing more microstates to be populated.
(c) The distribution of molecular speeds becomes broader, increasing the number of accessible microstates.
(d) The intermolecular forces become stronger, leading to less ordered motion.