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

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)xx24.2xx6)/(8)xx80 = 33516 J//mol or 33.15 KJ//"mol".`