Question

$1$ L of a hydrogen weighs as much as $1$ L of $C{O}_2$. The molecular formula of the hydrocarbon is :

• A. $C_3{H}_8$
• B. $C_2{H}_6$
• C. $C_2{H}_4$
• D. $C_3{H}_6$

Answer 1

The correct option is A $C_3{H}_8$

$1$ L of a hydrocarbon weighs as much as 1 L of $C{O}_2$.

Hence, the molar mass of hydrocarbon is equal to the molar mass of $C{O}_2$ which is $44$ g/mol.

The molecular formula of the hydrocarbon is $C_3{H}_8$ whose molar mass is $3\left(12\right)+8\left(1\right)=36+8=44g/mol$.