1.

Calculate the molecular masses of H_(2), O_(2), Cl_(2), CO_(2), CH_(4), C_(2)H_(6), C_(2)H_(4), NH_(3), CH_(3)OH.

Answer»

Solution :MOLECULAR mass = `"number of atoms" xx "atomic mass of the element"`
The molecular masses of
`H_(2) = 2 xx 1 = 2 u""O_(2) = 2 xx 16 = 32 u`
`Cl_(2)= 2 xx 35.5 = 71 u""CO_(2)= 1 xx 12 + 2 xx 16 = 12 + 32 = 44 u`
`CH_(4)= 1 xx 12+ 4 xx 1 = 12 + 4 = 16 u""C_(2)H_(6) = 2 xx 12 + 6 xx 1 = 24 + 6 = 30 u`
`C_(2)H_(4) = 2 xx 12 + 4 xx 1 = 24 + 4 = 28 u""NH_(3) = 1 xx 14 + 3 xx 1 = 14 + 3 = 17 u`
`CH_(3)OH= 1 xx 12 +3 xx 1 + 1 xx 16+ 1 xx 1 = 12 + 3 + 16 + 1 = 32 u`


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