Answer to Question #129941 in General Chemistry for Mary

Question

Good day,

When a solution of KOH is neutralized by hydrochloric acid, the solution gets hot.

Calculate the change in heat of the solution (in J).

Mass of combined solution = 42.0 g

Temperature change of the solution = 13.4 K

Specific heat capacity of the solution = 4.18 J/g·K

Please Give your answer to three significant figures.

Thanks

Answer 1

Mass of solution $(m)= 42.0\ g$

Temperature change $(\triangle T)=13.4\ K$

Specific heat capacity$(C)=4.18J/g.K$

Heat change will be $mC\triangle T=42.0\times 4.18\times 13.4=2352.504\ J$

$=2.35\times 10^3 J$ (in 3 significant figures)