Enthalpy of Formation
8. Thermochemistry / Enthalpy of Formation / Problem 6
Copper reacts with dilute nitric acid to produce copper nitrate, nitrogen dioxide and water:
Cu(s) + 4 HNO3(aq) → Cu(NO3)2(aq) + 2 NO2(g) + 2 H2O(l)
A 0.215 g piece of copper metal was mixed with a sufficient amount of dilute nitric acid to produce 100.0 mL solution in a coffee-cup calorimeter. Due to the exothermic reaction, the temperature of the mixture increased from 23.0°C to 25.5°C. Calculate the value of ΔH°rxn for this reaction. (Take d = 1.0 g/mL and C = 4.18 J/g•°C)
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