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A coffee cup calorimeter initially conta...

A coffee cup calorimeter initially contains 125 g of water, at a temperature of `24.2^(@)C`. 8 g 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 `4.2 J//.^(@) "C g"`.

A

33.51 KJ/mol

B

39.5 KJ/mol

C

32.2 KJ/mol

D

37.3 KJ/mol

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaH_("solution")=((125+8)xx24.2xx6)/(8)xx80 = 33516 J//mol or 33.15 KJ//"mol".`
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