001 moles of an unknown compound are combusted in a bomb cal

0.01 moles of an unknown compound are combusted in a bomb calorimeter, causing the temperature of the water in the calorimeter to increase by 4.3°C. If the effective heat capacity of the calorimeter is 5431 J/K, calculate U for the reaction. If a third of the water in the calorimeter were removed, how would this affect the experiment and the observations made?

Solution

Change in internal energy of the reaction is given by,

change in internal energy=heat capacityx change in temp.

=5431J/K *4.3

=2334.4J degree/K

heat capacity is given by mass xsp.heat.When 1/3 of water is removed, mass decreases by1/3 and hence heat capacity which will result in decrease in internal energy