Problem: Three of the reactions that occur when the paraffin of a candle (typical formula C21H44) burns are as follows:(1) Complete combustion forms CO2 and water vapor.(2) Incomplete combustion forms CO and water vapor.(3) Some wax is oxidized to elemental C (soot) and water vapor.Find ΔH°rxn of each reaction (ΔH°f of C21H44 = −476 kJ/mol; use graphite for elemental carbon).

Problem Details

Three of the reactions that occur when the paraffin of a candle (typical formula C21H44) burns are as follows:
(1) Complete combustion forms CO2 and water vapor.
(2) Incomplete combustion forms CO and water vapor.
(3) Some wax is oxidized to elemental C (soot) and water vapor.

Find ΔH°rxn of each reaction (ΔH°f of C21H44 = −476 kJ/mol; use graphite for elemental carbon).

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.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Hope-Weeks' class at TTU.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.