9. An unimown hydrocarbon cas has density of 5.6g/L while methane (CH4) at the ame conuliaioes hat a density of 3.2g/L. What is its molar mass of the unknown? a. 26g/mol b. 28g/mol c. 30g/mol d. 32g/mol c. 58g/mol 10. A flask is opened in a room containing the gases ammonia, hydrogen sulfide, and thiomethanol (CH3SH). What would be the order of arrival of the gases at the other side of the room? Presumably a student would be smelling each one as it arrives. We can also assume that the student is Saperman or Captain Marvel so he or she cannot be injured by any of rhe gases. a. ammonia, thiomethanol, hydrogen sulfide b. bydrogen sulfide, ammonia, thiomethanol c. thiomethanol, ammonia, hydrogen sulfide d. hydrogen sulfide, thiomethanol, ammonia e. ammonia, hydrogen sulfide, thiomethanol 11. An ideal gas 3. does not condense. b. follows the postulates of the kinetic theory of gases. c. has no intermolecular forces between molecules. d. follows all the above. e. follows none of the above. 12. A flask contains the following "ideal" gases: CO2,CH4, and C4H10. Which of the following is true? a. All of the gases have the same average speed. b. Butane has the highest average speed of the gases. c. All of the gases have the same average kinetic energy. d. Over time, butane accumulates near the bottom of the flask due to its mass. e. Methane has the slowest average speed