a Coffee cup calorimeter initially contains 125 g of water , at a temperature of `24.2^(@)`C ,8 of ammonium nitrate `(NH_(4)NO_(3))` also at `24.2^(@)C`is added to the Water and the final temperature is `18.2^(@)c` What is the heat of solution of ammonium nitrate in KJ /mol? (The specific heat capacity of the solution is `4.2J//^(@)c`.)

Options

A. 33.51 kJ/mol
B. 39.5 kJ/mol
C. 32.2 kJ/mol
D. 37.3 kJ/mol

Answer

A

Explanation

`DeltaH_("solution")=((125+8)xx4.2xx6)/(8)xx80=33516" J"//"mol or 33.51 kJ"//"mol"`