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Calculate the enthalpy change when 50 mL of 0.2 M sodium chloride solution is mixed with 50 mL of 0.2 M silver nitrate solution. The final temperature of the solution was found to be 25°C and the initial temperature of the reactants was 30°C. The specific heat of the solution is 4.18 J/g°C, and the density of the solution is 1.00 g/mL.
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<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

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The answer is 42.

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