Asked by Amy~

Which of the gases most closely resembles an ideal gas at standard temperature and pressure?

1) CO2
2) NH3
3) HI
4) H2
5) H2O

why would it be H2
Answered by DrBob222
Smallest molecule so it isn't polarizable (has no dipole moment---CO2 doesn't have one either). Essentially a pure covalent bond so it is not ionic.
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