Question

`20.0 g` of ammonium nitrate `(NH_(4)NO_(3))` is dissolved In `125 g` of water in a coffee-cup calorimeter, the temperature falls from `296.5 K` to `286.4 K`. Find the value of `q` for the calorimeter. (Hint: heat capacity of water as the heat capacity of the calorimeter and its content)

Answer 1

Mass of water `=125 g`
Mass of ammonium nitrates `=20.0 g`
Fall of temperatures,
`DeltaT=286.4-(296.5)=-10.1 K`
Heat capacity of the calorimeter, `c=4.18 J//g K`
`q=mxxCxxDeltaT=125xx4.18xx(-10.1)xx10^(-3)=-5.28 kJ`