# Problem: A sample of a hydrocarbon is combusted completely in O2(g) to produce 24.01 g CO2(g), 4.917 g H2O(g), and 342 kJ of heat.Do you think that the hydrocarbon is one of those listed in Appendix C? Explain your answer.

###### FREE Expert Solution

Determine the empirical formula of the hydrocarbon: (C and H only)

Recall that:

• 1 mole of C in 1 mole of CO2
• 2 moles of H in 1 mole of H2O.

Find moles of C and H:

moles C = 0.55 mol C

moles H = 0.545 mol H

Get smallest ratio of C, H (divide by 0.545):

The empirical formula: CH

Balanced equation: 2CH + O2 → CO2 + H2O

79% (38 ratings) ###### Problem Details

A sample of a hydrocarbon is combusted completely in O2(g) to produce 24.01 g CO2(g), 4.917 g H2O(g), and 342 kJ of heat.

Do you think that the hydrocarbon is one of those listed in Appendix C? Explain your answer.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Enthalpy of Formation concept. You can view video lessons to learn Enthalpy of Formation. Or if you need more Enthalpy of Formation practice, you can also practice Enthalpy of Formation practice problems.