.5 g of Ca is added to 50ml of 1.0 M HCL. Once the reaction is complete, the temperature of the solution...?
has risen from 25.2 to 71.4. The reaction proceeds by the following equation:

Ca(s) + 2H----Ca(aq) + H2(g)

Calculate:
a. the heat gained by the solution

Question

.5 g of Ca is added to 50ml of 1.0 M HCL. Once the reaction is complete, the temperature of the solution...? 
has risen from 25.2 to 71.4. The reaction proceeds by the following equation: 

Ca(s) + 2H---->Ca(aq) + H2(g) 

Calculate: 
a. the heat gained by the solution

anonymous · Answer

When dealing with heat gained by the solution, use the formula E=-mcT, where E is energy, T is change in temperature, c is specific heat capacity (generally of water) and m is mass, but you can also use volume of the liquid only.
Therefore E=-50*4.18*(71.4-25.2)= 9655.8 J