Question # 29 please. 28. If oxygen gas and hydrogen gas are kept at the same te
ID: 593430 • Letter: Q
Question
Question # 29 please.
28. If oxygen gas and hydrogen gas are kept at the same temperature and pressure, the hydrogen lecules on the average (A) move faster than the oxygen molecules. ) move more slowly than the oxygen molecules (C) move at the same speed as the oxygen molecules. (D) have the greater kinetic energy. (E) have a lower kinetic energy 29. The volume of a given mass of gas varies inversely with pressure, provided that the temperature remains constant because (A) attractive forces between gas molecules are negligible. (B) attractive forces between gas molecules are appreciable (C) the average kinetic energy of the molecules of a gas is proportional to the absolute temperature. (D) increasing the molecular concentration, at constant temperature, means increasing the number of collisions between molecules and container. (E) collisions between gas molecules are perfectly elastic. 30. What volume of COa gas at 645 torr and 800 K would be produced by the reaction of 45 g of 8 (A) 0.449 L (B) 22.4 L 25.0 L (D) 34.8 L (E) 45.7 mLExplanation / Answer
from ideal gas law, PV= nRT
where n is no of moles, R is gas constant and T is temperature in K.
when n and T are constant, PV= constant or V is inversly proportional to pressure. Hence this is true only if no of moles of gas and Temperature ( in K) are constant. Ideal gas law is valid only when the forces of attraction between gas moleciles can be neglected.
A is correct.