Calculate the molecular mass of the following substance
(i) water `(H_(2)O)` (ii) Sulphur dioxide `(SO_(2))`
(iii) Oxygen molecule `(O_(2))` (iv) Carbon monoxide (CO)

Explanation

(i)Water `(H_(2)O)`
`"Molecular mass of "H_(2)O=(2xx"Atomic mass of H")+1xx"Aromic mass of O")`
(ii) Sulphur dioxide `(SO_(2))`
`"Molecular mass of "S_(2)O=(1xx"Atomic mass of S")+(2xx"Aromic mass of O")`
`=(1xx32u)+(2xx16u)=64u`
(iii) Oxygen molecule `(O_(2))`
`"Molecular mass of "O_(2)=2xx"Aromic mass of O"`
=`(2xx16u)=32u`
(iv) Carbon monoxide (CO)
`"Molecular mass of "CO=(1xx"Aromic mass of C")+(1xx"Atomic mass of O")`
=`(1xx12u)+(1xx16u)=28u`