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Find for the combustion of naphthalene. The heat capacity of the calorimeter, de

ID: 600947 • Letter: F

Question

Find for the combustion of naphthalene. The heat capacity of the calorimeter, determined in separate experiment, is .

Explanation / Answer

The balanced equation would be: C10H8 (s) + 12 O2 (g) ---> 10 CO2 (g) + 4 H2O (g) + heat From the data, the number of moles of Naphthalene used is: 1.025 g / 128.2 g/mol = moles of C10H8 The change in temperature is: 32.33 °C - 24.25 °C = 8.08 °C If only the calorimeter changed temperature (no outside loss or water jacket), then the change in heat energy is: 8.08 °C * 5.11 kJ/ °C = ?E To get the ?Erxn (per mole), divide the ?E above by the moles of C10H8 used.

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