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A sealed flask containing 1.0 mole of H2(g) and a sealed flask containing 2.0
moles of He(g) are at the same temperature. The two gases must have equal
1. masses
2. volumes
3. average kinetic energies
4. numbers of molecules

Chemistry 
tera,
I believe it is 4.

Chemistry 
DrBob222,
You haven't said anything about the volume of the containers or their pressures; therefore, I don't see how either 1 or 2 can be correct. The number of molecules certainly isn't correct since 2 moles He will contain twice as many molecules as 1 mole of H2.

Chemistry 
christina,
the answer is 3