# Problem: Calculate ΔHrxn for the following reaction: CH4(g)+2O2(g)→CO2(g)+2H2O(l) Use the following reactions and given ΔH′s. CH4(g)+O2(g)→CH2O(g)+H2O(g), ΔH = -284 kJ CH2O(g)+O2(g)→CO2(g)+H2O(g), ΔH = -527 kJ H2O(l)→H2O(g), ΔH = 44.0 kJ

###### FREE Expert Solution

Apply Hess’s Law to determine the ΔH of the overall reaction where we have to get the sum of ΔH of the elementary reactions given

• The overall reaction appears to be:

CH4(g)+2O2(g)→CO2(g)+2H2O(l)

• And the elementary reactions are:

CH4(g)+O2(g)CH2O(g)+H2O(g), ΔH = -284 kJ

CH2O(g)+O2(g)CO2(g)+H2O(g), ΔH = -527 kJ

H2O(l)H2O(g), ΔH = 44.0 kJ

100% (338 ratings) ###### Problem Details

Calculate ΔHrxn for the following reaction: CH4(g)+2O2(g)→CO2(g)+2H2O(l)

Use the following reactions and given ΔH′s.

CH4(g)+O2(g)→CH2O(g)+H2O(g), ΔH = -284 kJ

CH2O(g)+O2(g)→CO2(g)+H2O(g), ΔH = -527 kJ

H2O(l)→H2O(g), ΔH = 44.0 kJ

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