Question

What is the mass per cent of carbon in carbon dioxide ?

(a) 0.034% (b) 27.27% (c) 3.4% (d) 28.7%

Answer 1

(b)

Molecular mass of $C{O}_2=1\times 12+2\times 16=44g$

1 g molecular of $C{O}_2=1\times 12+2\times 16=44g$

$\because$ 44 g of $C{O}_2$ contain C = 12 g atoms of carbon

$\therefore$ % of C in $C{O}_2=\frac{12}{44}\times 100=27.27\%$

Hence, the mass per cent of carbon in $C{O}_2$ is 27.27%