Calculate the molecular mass of the following:
a. `H_(2)O`
b. `CO_(2)`
c. `CH_(4)`

Explanation

(i) `H_(2)o`
the molecular of water ,`H_(2)O`
`=(2 xx "atomic mass ofhydrogen ") +(1+ "atomic Mass of oxygen ") `
`=[2(1.0084)+1(16.00u)]`
`2.016 u +16.00 u`
`=18.016`
`=18.02 u`
(ii) ` CO_(2)` :
the molecular Mass of carbon dioxide ,`CO_(2)`
`=(1 xx "Atomic mass of carbon ") +(2 xx"Atomic Mass of oxygen ")`
`=[1(12.011 u)+2(16.00 u)]`
`=12.011 u +32.00 u`
(iii) `CH_(4) `:
the molecular mass of methane ,`CH_(4)`
`=(1 xx "Atomic mass of carbon )+ (4xx "Aatomic Mass of hydrogen ")`
`=[1 (12.011 u) +4(1.008 u)]`
`=12.011 u + 4.032 u`
`=16.043 u`