Chemical Thermodynamics Question 486

Question: A coffee cup calorimeter initially contains 125 g of water, at a temperature of 24.2C . 8 g of ammonium nitrate (NH4NO3), also at 24.2C, is added to the water, and the final temperature is 18.2C what is the heat of solution of ammonium nitrate in kJ/mol- The specific heat capacity of the solution is 4.2J/Cg .

Options:

A) 33.51 kJ/mol

B) 39.5 kJ/mol

C) 32.2 kJ/mol

D) 37.3 kJ/mol

Show Answer

Answer:

Correct Answer: A

Solution:

  • ΔHsolution=(125+8)×4.2×68×80=33516J/mol

33.51kJ/mol.



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