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What is the enthalpy change (ΔH) for the precipitation reaction between aqueous solutions of barium chloride (BaCl₂) and sulfuric acid (H₂SO₄) to form solid barium sulfate (BaSO₄) and aqueous hydrochloric acid (HCl), given that 100.0 mL of 0.200 M BaCl₂ were mixed with 150.0 mL of 0.100 M H₂SO₄ at 25°C and that the resulting solution was allowed to come to equilibrium?
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<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

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<|begin_of_solution|>

The answer is 42.

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