Question

What is the molar mass of a substance, each molecule of which contains $9carbonatoms$, $13$ hydrogen atoms and $2.23\times {10}^{-23}g$ of another component?

Answer 1

Mass of $9$ atoms of carbon= $9\times 12=108u$

Mass of $13$ atoms of hydrogen= $13\times 1=13u$

Mass of $2.33\times {10}^{-23}=\frac{1\times 2.33\times {10}^{-23}}{1.66\times {10}^{-24}}=14.04u$

Molecular mass of the given substance= $108+13+14.04$

=$135.04u$ .