An unknown compound contains only carbon, hydrogen, and oxygen (cxhyoz). combustion of 5.00g of this compound produced 7.33g of carbon dioxide and 3.00g of water. question: how many moles of carbon, c, were in the original sample? express your answer to three significant figures and include the appropriate units.

A combustion reaction involves an organic compound reacted with oxygen. The general chemical equation is as follows:

Organic Compound + Oxygen = CO2 + H2O

To calculate the amount of C present in the original sample, we use the values given and assume that there is complete combustion that is happening.

7.33 g CO2 ( 1 mol CO2 / 44.01 g CO2)(1 mol C / 1 mol CO2) = 0.167 mol C

Therefore, 0.167 mol of C was originally in the sample.

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