Chemical Thermodynamics Question 486
Question: A coffee cup calorimeter initially contains 125 g of water, at a temperature of $ 24.2{}^\circ C $ . 8 g of ammonium nitrate $ (NH_4NO_3), $ also at $ 24.2{}^\circ C, $ is added to the water, and the final temperature is $ 18.2{}^\circ C $ what is the heat of solution of ammonium nitrate in kJ/mol- The specific heat capacity of the solution is $ 4.2J/{}^\circ 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:
- $ \Delta H_{solution}=\frac{(125+8)\times 4.2\times 6}{8}\times 80=33516J/mol $
$ 33.51kJ/mol. $
