Stoichiometry
1 gm mole of methane (CH₄) contains

3.01 x 1023 molecules of methane
3 gms of carbon
4 gm atoms of hydrogen
6.02 x 1023 atoms of hydrogen

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Stoichiometry
An ideal gas can be liquified, because

Forces operative between its molecules are negligible
Its critical temperature is more than 0°C
It gets solidified directly without becoming liquid
Its molecular size is very small

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