What is the percentage composition of nicotine?

What is the percentage composition of nicotine?Here it is.
Nicotine is a compound that contains carbon, hydrogen and oxygen. If a 2.5 g sample of nicotine is burned in oxygen, 6.78 g of carbon dioxide, 1.94 g of water and 0.432 of nitrogen are the products of combustion. What is the percentage composition of nicotine?

Guys, I really need your help on this. I'm not good in chemistry and I know some of you are. Thanks.

bookworm
if nicotine contains C,H and O we can write a formula like this :
CxHyOz ----------> CO2 + H2O + N2


moles of CO2 gained = 6.78g/ 44 g/mol = o.154 mol
so thr mst b 0.154 mol of C

moles of H2O = 1.94g / 18 g/mol = 0.108 mol
so thr mst b 0.216 mol of H

moles of N2 =0.432g/ 28 g/mol = 0.0154 mol
so thr mst b 0.0308 mol of N

moles of O must be; 0.154*2 + 0.108 =0.416 mol

C H O N

num f moles 0.154 0.216 0.416 0.0154

devide by the smallest number (0.0154)

10 14 27 1

therefore the composition of nicotine must be as follows;
C10 H14 O27 N

<<<>>>>>>>>>>>>>>>>

Give your answer to this question below! Smoking Cessation - Quit Smoking Today. Smoking Cessation helps smokers kick their nicotine addiction, providing tools, information and support for people quitting smoking.

---

Orignal From: What is the percentage composition of nicotine?