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Given the reaction: CH4(g) + 2 O2(g) -->2 H2O(g) + CO2(g) What is the overall result when CH4(g) burns according to this reaction? (1) Energy is absorbed and DH is negative. (2) Energy is absorbed and
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Given the reaction:

CH4(g) + 2 O2(g) -->2 H2O(g) + CO2(g)
What is the overall result when CH4(g) burns
according to this reaction?
(1) Energy is absorbed and DH is negative.
(2) Energy is absorbed and DH is positive.
(3) Energy is released and DH is negative.
(4) Energy is released and DH is positive.

User LancerX
by
8.3k points

1 Answer

3 votes
(3) Energy is released and
\Delta H is negative.
This is a combustion reaction, and as you know, a combustion reaction releases energy (evidence: fire :P). If it releases energy, than the enthalpy of the compounds would obviously decrease.
User Gabriel Durac
by
8.2k points
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