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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

  • Chemistry -

    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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