a) Hydrogen has an atomic mass of 1.00794 and chlorine has an atomic mass of 35.453. (here I am not sure I should include the RMM because I am not supposed to be doing any calculations).
find the mass of 2 hydrogen atoms, because thats what a molecule of hydrogen (H2
). Same goes for chlorine, Cl2
i dont think they were asking for the ratio of the masses. geo just pointed out that the "relative" is to mean their mass as defined by 1/12 of a C atom , not that Cl is relative to H.
b) Because both gases are in the same container, they must share the same temperature. However, it is impossible to know the exact temperature to an degree of accuracy because there are a wide range of temperatures in which the molecules would remain in a gaseous state.
Borek mentioned that you need not explained so much, because a mixture has the same properties as its constituents, after all.
c) If both gases share the same temperature, then the average kinetic energy would be the same for both types of molecules. Kinetic Molecular Theory postulates that although each molecule may not have the same kinetic energy, the average kinetic energy of a system is proportional to the temperature.
Borek has a point. be specific in your descriptions to avoid ambiguity. try not to copy your text word-by-word, but adapt it to what you understand. the text is correct, but it is quite vague. its your job to clear it up
d) The molecules would be in constant, rapid motion in a straight line. The degree of motion would be related directly to the temperature. If the molecules were at a high temperature they would move more quickly than at a low temperature. However their speeds of the two types of molecules would be different. The hydrogen molecules would be moving faster than the chlorine molecules because they are lighter and it follows that to maintain the same kinetic energy of the heavier chlorine molecules, they would have to be moving more rapidly.
you need not say anything about the direction. they asked for "speed", not "velocity". so just explain the magnitude of speed.
degree of motion can be meant as the direction it moves, or the magnitude at which it moves. again this is ambiguous and should be rectified.