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`.

Explanation

(i) Molecular mass of `H_(2) =` Mass of `2H` atoms
`= 2 xx 1`
`= 2u`
(ii) Molecular mass of `O_(2) =` Mass of 2 'O' atoms
`= 2 xx 16`
`= 32 u`
(iii) Molecular mass of `Cl_(2) =` Mass of `2Cl` atoms
`= 2 xx 35.5`
`= 71 u`
(iv) Molecular mass of `CO_(2) =` Mass of C atom + Mass of 2 'O' atoms
`= 12 + 2 xx 6`
`= 12 + 32`
`= 44 u`
(v) Molecular mass of `CH_(4) =` Mass of C atom + Mass of 4H atoms
`= 12 + 4 xx 1`
`= 12 + 4`
`= 16 u`
(vi) Molecular mass of `C_(2)H_(6) =` Mass of 2C atoms + Mass of 6H atoms
`= 2 xx 12 + 6 xx 1`
` = 24 + 6`
`= 30 u`
(vii) Molecular mass of `C_(2)H_(4) =` Mass of 2C atoms + Mass of 4H atoms
` = 2 xx 12 + 4 xx 1`
`= 28 + 4`
`= 28 u`
(viii) Molecular mass of `NH_(2) =` Mass of N atom + Mass of `3H` atoms
`= 14 + 3 xx 1`
` = 14 + 3`
`= 17 u`
(ix) Molecular mass of `CH_(3)OH =` Mass of C + Mass of H + Mass of O
`= 12 + 4 xx 1 + 16`
` = 12 + 4 + 16`
` = 32 u`