However, the water provides most of the heat for the reaction. where the work is negatively-signed for work done by the system onto the surroundings. Divide 197g of C by the molar mass to obtain the moles of C. From the balanced equation you can see that for every 4 moles of C consumed in the reaction, 358.8kJ is absorbed. We will also explain the difference between endothermic and exothermic reactions, as well as provide you with an example of calculations. Exothermic reactions have negative enthalpy values (-H). He is the author of Biochemistry For Dummies and Chemistry For Dummies, 2nd Edition.

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