When 500 mL of 0.100 MAgNO3 is combined with 500 mL of HCl in a coffee-cup calorimeter, the temperature changes from 23.40 ∘C to 24.21 ∘C. Calculate ΔHrxn for the reaction as written. Use 1.00 g/mL as the density of the solution and C=4.18J / (g⋅∘C) as the specific heat capacity.

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Chemistry

Blaine Shepherd

12 January, 10:17

When 500 mL of 0.100 MAgNO3 is combined with 500 mL of HCl in a coffee-cup calorimeter, the temperature changes from 23.40 ∘C to 24.21 ∘C. Calculate ΔHrxn for the reaction as written. Use 1.00 g/mL as the density of the solution and C=4.18J / (g⋅∘C) as the specific heat capacity.

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Mathew Haney · Answer 1

The heat released by the reaction is absorbed by the solution, resulting in the temperature change.

Mass of solution = density x volume

Mass = 500 x 1 = 500 grams

Heat absorbed:

Q = mCpΔT

Q = 500 x 4.186 x (24.21 - 23.4)

Q = 1,695 J

Moles of silver nitrate = molarity x volume in L

Moles of silver nitrate = 0.1 x 0.5

Moles of silver nitrate = 0.05

Heat of reaction = 1,695 / 0.05

Heat of reaction = 33.9 kJ/mol