Question

Calculate the number of hydrogens present in an alkane, containing 15 carbons atoms. [2 marks]

Answer 1

The general formula of alkanes is ${\text{C}}_n{\text{H}}_{2n+2}$. [1 marks]
The molecular formula of an alkane with 15 carbon atoms will be:
n=15, so ${\text{C}}_n{\text{H}}_{2n+2}$ = ${\text{C}}_{15}{\text{H}}_{32}$.
Therefore, 32 hydrogen atoms are present in an alkane, containing 15 carbon atoms. [1 marks]