A calorimeter contains 16.0 mL of water at 11.5 C . When 1.80 g of X (a substanc

Question

A calorimeter contains 16.0 mL of water at 11.5 C . When 1.80 g of X (a substance with a molar mass of 58.0 g/mol ) is added, it dissolves via the reaction X(s)+H2O(l)X(aq) and the temperature of the solution increases to 27.5 C . Calculate the enthalpy change, H, for this reaction per mole of X. Assume that the specific heat of the resulting solution is equal to that of water [4.18 J/(gC)], that density of water is 1.00 g/mL, and that no heat is lost to the calorimeter itself, nor to the surroundings. Express the change in enthalpy in kilojoules per mole to three significant figures.

Explanation / Answer

A calorimeter contains 16.0 mL of water at 11.5 C . When 1.80 g of X (a substanc

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