A calorimeter contains 30.0 mL of water at 15.0 C. When 1.50 g of X (a substance with a molar mas of 46.0g/ mol is added, it dissolves via the reaction

Question

X (s) + H2O (l) ----> X (aq)

and the temperature of the solution increases to 26.5 C.

Calculate the enthalpy change for this reaction.

So is the answer supposed to be positive.

Answer 1

No. The temperature increased from 15 to 26.5 and that makes it an exothermic reaction so dH is -.

Answer 2

-14.5