Carbon dioxide gas and hydrogen sulfide gas are kept in two separate containers of equal volume at the same temperature and pressure. Which of the following is true?
A. the masses of the 2 gases are equal
B. the average velocities of the molecules of the 2 gases are equal
C. the number of molecules of each gas are equal
D. On the average, the carbon dioxide molecules are moving faster than the hydrogen sulfide molecules
E. more than one of these is correct
A. the masses of the 2 gases are equal
B. the average velocities of the molecules of the 2 gases are equal
C. the number of molecules of each gas are equal
D. On the average, the carbon dioxide molecules are moving faster than the hydrogen sulfide molecules
E. more than one of these is correct
-
C. If the temperature, pressure, and volume of container are the same then the number of particles of each gas must also be the same.
It is not E because the masses would not be equal, the average velocities are not equal, hydrogen sulfide would be moving faster.
It is not E because the masses would not be equal, the average velocities are not equal, hydrogen sulfide would be moving faster.
-
The answer is C.
By using gas law, PV=nRT, where P (pressure), V (volume), R (a constant), T (temperature) are the same for both separate containers. Therefore, n (number of moles) would be the same as well (ie. the number of molecules of each gas are equal.)
A cannot be right because CO2 and Hydrogen sulfide have different molar mass, so even the number of moles is the same, the masses of the 2 gases would be different. B cannot be right because one would travel faster than the other due to the fact that they have different mass, one is heavier than the other. D cannot be right because CO2 is heavier than Hydrogen Sulfide, so it should move slower instead. Hence, E cannot be right, leaving us with answer C.
By using gas law, PV=nRT, where P (pressure), V (volume), R (a constant), T (temperature) are the same for both separate containers. Therefore, n (number of moles) would be the same as well (ie. the number of molecules of each gas are equal.)
A cannot be right because CO2 and Hydrogen sulfide have different molar mass, so even the number of moles is the same, the masses of the 2 gases would be different. B cannot be right because one would travel faster than the other due to the fact that they have different mass, one is heavier than the other. D cannot be right because CO2 is heavier than Hydrogen Sulfide, so it should move slower instead. Hence, E cannot be right, leaving us with answer C.