A.) the nutritional calorie (calorie) is equivalent to 1 kcal. one pound (1.0 lb) of body fat is equivalent to 4.1x10^3 kcal. express this quantity in joules and kilojoules. use scientific notation for your answer!

B.) if an athlete expends 1850KJ/h (kilojoules per hour), how long does he have to exercise to work off 1.0lb of body fat?

C.) the average amount of calories burned during running is 125kcal/mile. how many miles does this athlete have to run to burn off 1.0lb of body fat?

Calculate (triangle)Hrxn for the following reaction using Hess's law 2NOCl(g) --> N2(g) + O2(g) + Cl2(g) given the following set of reactions

1/2N2(g) + 1/2O2(g)--> NO9(g) (triangle)H= 90.3kJ

NO(g) + 1/2Cl2(g)--> NOCl(g) (triangle)H= -38.6kJ