Question

A compound of C,H and N contains 66.70℅ carbon,7.41% hydrogen and 25.90% Nitrogen. The molecular mass of the compound was found to be 108.
find the empirical and molecular formula of the compound

Answer 1

Answer:

Say you have 1 mole, or 108 grams of the compound.

The ratio says that for every 9 grams of Carbon, you have 1 gram of Hydrogen and 3.5 grams of Nitrogen. Sum this up and you get 13.5 grams - how convenient, it’s a factor of 108!

So now we multiply everything by 10813.5\equals810813.5\equals8 and we get 72 grams of Carbon, 8 grams of Hydrogen, and 28 grams of Nitrogen.

Divide those numbers by molar masses and you get 6 moles of Carbon, 8 moles of Hydrogen, and 2 moles of Nitrogen per mole of the compound.

In other words:

C6H8N2C6H8N2

which can be many compounds but you’re not required to find the structure.