Question 6 (1 point) When (8.1x10A-1) mole of an inorganic salt were dissolved i

Question

Question 6 (1 point) When (8.1x10A-1) mole of an inorganic salt were dissolved in 1.00 L of water in a constant pressure calorimeter, the temperature of the calorimeter changed from 25.00°C to (2.58x101) oC. The total heat capacity of the calorimeter (including all its contents) was C- (2.010x10^O) kJ oC-1. Calculate the molar enthalpy of solution for this salt, H (in J mol-1). Pay attention to sign and significant figures, keeping in mind that a temperature difference is measured in the experiment. Use scientific notation, do not enter units. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer

Explanation / Answer

Change in Temperature = Final Temperature - Initial Temperature

=> 25.80 - 25.00

=> 0.80C

Heat Evolved = Total heat capacity of calorimeter * Change in Temperature

=> 2.010 kJ/C * 0.80C

=> 1.60800 kJ

Molar enthalpy of solution = Heat Evolved/Number of moles = 1.60800 kJ/0.81 = 1.9851 kJ/mol

molar enthalpy in J/mol = 1985.1 J/mol = 1.985 * 10^3 J/mol

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