General Chemistry Enthalpy Worksheet with Solutions, Exercises of Chemistry

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1 | Enthalpy Worksheet Enthalpy Worksheet 1. The combustion of methane, CH, releases 890.4 kJ/mol of heat. That is, when one mole of methane is bummed, 890.4 kJ are given off to the surroundings. This means that the products have 890.4 kJ less energy stored in the bonds than the reactants. Thus, AH for the reaction = —890.4 kJ. A negative symbol for AH indicates an exothermic reaction. CH ig) + 2 Org) a CO x») +2 A202) AH = —890.4 kJ A. How much energy is given off when 2.00 mol of C44 are bumed? B. How much energy is released when 22.4 g of C4 are burned? C. If you were to attempt to make 45.0 g of methane from CO2 and H20 (with O2 also being produced), how much heat would be absorbed during the reaction?