A 500 mL sample of 0.5 M NaOH at 20 C is mixed with an equal volume of 0.5 M HCl at the same temperature in a calorimeter. The temperature rises to 23.21 C. Calculate the heat of the reaction. ( - 53.72 kJ/mol)

Question

Sebastian Warren

Chemistry

26 February, 02:42

A 500 mL sample of 0.5 M NaOH at 20 C is mixed with an equal volume of 0.5 M HCl at the same temperature in a calorimeter. The temperature rises to 23.21 C. Calculate the heat of the reaction. ( - 53.72 kJ/mol)

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Roth · Answer 1

Answer: Heat of reaction ∆H = - 13.43kJ

Explanation:

The number of moles of NaOH = the number of moles of HCL = N

N = concentration * volume = CV = 0.5M * 500mL/1000ml/L

N = 0.5 * 0.5 = 0.25mol

Since the Molar enthalpy is given by Hm = - 53.72kJ/mol

Heat of reaction ∆H = N*Hm

∆H = 0.25mol * - 53.72kJ/mol = - 13.43kJ

Heat of reaction ∆H = - 13.43kJ