Calculate the molecular masses of H2,O2,...

Calculate the molecular masses of `H_2,O_2,Cl_2, CO_2,CH_4,C_2H_4,NH_3,CH_3OH`.

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Molecular mass of `NH_(3)`
= Atomic mass of `N + 3 xx ` Atomic mass of H
= `14 u xx 3 xx 1 u`
`=14u + 3u`
`= 17 u`

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