Question

Calculate the mass of a single atom of sulphur and a single molecule of carbon dioxide.

Answer 1

Gram-atomic mass of sulphur $=32$ g
Mass of one sulphur atom $=\frac{Gram-atomicmass}{6.02\times {10}^{23}}$
$=\frac{32}{6.02\times {10}^{23}}=33\times {10}^{-23}g$
Formula of carbon dioxide $=C{O}_2$
Molecular mass of $=C{O}_2=12+2\times 16=44$
Gram-molecular mass of $C{O}_2=44g$
Mass of one molecule of $C{O}_2=\frac{Gram-atomicmass}{6.02\times {10}^{23}}$
$=\frac{44}{6.02\times {10}^{23}}=7.308\times {10}^{-23}g$