Question

$0.1$ mole of carbohydrate with empirical formula $C{H}_{2}O$ contains $1g$ of hydrogen what is its molecular formula?

• A. $C_5{H}_{10}{O}_5$
• B. $C_6{H}_{12}{O}_6$
• C. $C_4{H}_8{O}_4$
• D. $C_3{H}_6{O}_3$

Answer 1

The correct option is A $C_5{H}_{10}{O}_5$

Let molecular formula be ($C{H}_{2}O$) n

In one mole of carbohydrate, there is $2n$ g of hydrogen present.

So, 0.1 mole of carbohydrate there is $2n/1\times 0.1$ g of hydrogen which is equal to 1g

$2n/1\times 0.1$= 1

$n=5$

Molecular formula = $C_5{H}_{10}{O}_5$