Answers: 1
(
in some textbooks) here stands for standard enthalpy change per mole reaction. To find the amount of energy released in this reaction, start by finding the number of moles of this reaction that will take place.
. 
of carbon will support 
value here is negative. But don't panic. 
means that the chemical potential energy drops by 
during each mole of the reaction (with the coefficients as-is.) Those energy difference will be released as heat. In other words, one mole of the reaction will release 
of energy.
.
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