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Calculate the molecular weight H2,O2,Cl2...

Calculate the molecular weight `H_2,O_2,Cl_2,CO_2CH_4,C_2H_6,C_2H_4,NH_3,CH_3OH`.

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Molecular weight of `H_2=2 times 1`=2 u
Molecular weight of `O_1=2 times 16`= 32 u
Molecular weight of `Cl_2=2 times 35.5`= 71 u
Molecular weight of `CO_2=12+2 times 16`=44 u
Molecular weight of `CH_4=12+4 times 1`= 16 u
Molecular weight of `C_2H_6=2 times 12+6 times 1`=30 u
Molecular weight of `C_2H_4=2 times 12+4 times 1`=28 u
Molecular weight of `Nh_3=14+3 times 1=17u`
Molecular weight of `CH_3OH=12+4 times 1+16=32u`
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