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Problem: When solid NH4NO3 is dissolved in water at 25°C, the temperature of the solution decreases. What is true about the signs of ΔH and ΔS for this process?  (A) ΔH is negative, ΔS is positive (B) ΔH is negative, ΔS is negative (C) ΔH is positive, ΔS is positive (D) ΔH is positive, ΔS is negative

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Problem Details

When solid NH4NO3 is dissolved in water at 25°C, the temperature of the solution decreases. What is true about the signs of ΔH and ΔS for this process? 

(A) ΔH is negative, ΔS is positive

(B) ΔH is negative, ΔS is negative

(C) ΔH is positive, ΔS is positive

(D) ΔH is positive, ΔS is negative

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Based on our data, we think this problem is relevant for Professor Dockery's class at KSU.