Question

Calculate the amount of energy that can be stored in 49.9 mL of an aqueous solution of calcium chloride hexahydrate by raising the temperature from 19.8 ℃ to 37.4 ℃. The specific heat capacity of water is 4.184 Jg^-1 K^-1 .

Answer 1

Let us take that X molar solution was taken.

It means in 1000 ml solution calcium chloride hexahydrate was present 219*X gm. As molecular weight is 219 gm/mol.

Clearly in 49.9 mL solution calcium chloride hexahydrate was present (219*X)*49.9/1000 gm.

Now heat energy that can be stored = mass*temperature difference*specific heat capacity

= (219*X*49.9*(37.4-19.8)*4.184)/1000 joule

= 804.7*X joule

Now if we deal with 1 molar solution, X=1 , thus heat energy stored will be 804.7 joule.

Hope you like it.