# This problem illustrates how combustion can be used to determine the molecular formula of an unknown compound.

## Question:

This problem illustrates how combustion can be used to determine the molecular formula of an unknown compound. A compound X (8.00 mg) undergoes combustion in a stream of oxygen to give 24.60 mg of CO_{2} and 11.51 mg of H_{2}O.

(a) Calculate the mass of carbon and hydrogen in X.

(b) How many moles of H are present in X per mole of C? Express this as a formula C_{1}H_{x}.

(c) Multiply this formula by successive integers until the amount of H is also an integer. This is the molecular formula of X.

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