Question

Suppose that the 10.0 g of NH, is formed in a bomb calorimeter, and that all of the evolved heat for the exothermic reaction is completely absorbed by the surrounding 1000 g of water. Find the change in temperature (AT), and the final temperature (Tr) of the water if it is nitially at 20.0 °C. Note that the heat is negative for the reaction, but positive for the water in the calorimeter. Review example 6.5. Show all units. (2 pts) 3.

Answer 1

Answer:

Reaction involve N_2(g) + 3H_2(g) rightarrow 2NH_3 (g) delta H = 46kJ/mole therefore 2 mole means 34 gm of NH_3 evolved 46 KJ therefore 10 gm 46 times /34 times 10 threrfore Heat released = 13.53 KJ Now Heat released by = Heat absorbed by NH_3 H_2O 13.53 times 10^3 = 100(4.186)(delta T) therefore change in temp (delta T) = 32.32 degree c therefore if T_i = 20 degree c then T_f = 32.32 + 20 = 52.32 degree c