- #1

chawki

- 506

- 0

## Homework Statement

Caffeine, a stimulant found in coffee, tea, chocolate, and some medications,

contains 49.48% carbon, 5.15% hydrogen, 28.87% nitrogen, and 16.49% oxygen

by mass and has a molar mass of 194.2.

## Homework Equations

Determine the molecular formula of caffeine.

## The Attempt at a Solution

CxHyNzOn

12x/C% = 194.2/100% and we find x = 8

by the same method we do it for H, N and O and we find y=10, z=4, n=2

so the formula is C

_{8}H

_{10}N

_{4}O

_{2}

Plz tell me if i should add something to my solution in the beginning, like the name of this law, i forgot how we called it at college...