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## Homework Statement

Q. A Hydrocarbon (C

_{n}H

_{m}) is burned completely in oxygen to produce a mixture of CO

_{2}and H

_{2}O. The total pressure of mixture is 1.200 atm and partial pressure of H

_{2}O is 0.686 atm. What is empirical formula of Hydrocarbon

## Homework Equations

pV=nRT

p

_{a}/p

_{total}= n

_{a}/n

_{total}

## The Attempt at a Solution

The answer is C

_{3}H

_{8}aka Propane

Im so confused! I don't even know where to start with this!!