I am having difficulty with a few chemistry problems I don't even know how to start, so if you can tell me step by step how to get the answer or start me in the right direction that would be very helpful.
1) Sucrose, C12H22O11, is found to have a standard enthalpy of combustion of -5640.9 kj mole-1. The standard enthalpies of formation or CO2(g) and H20(l) are, -393.51 and -285.83 kj mole-1. Compute ?H?f for sucrose.
2) The enthalpy of solution of NaOH by dissolving 4.00g of NaOH(s) in 180ml of pure water (destiny 0.999 g ml-1) at an inital temperature of 19.5?C. Temperature-time data collected after mixing was extrapolated back to the time of mixing to obtain a temperature change, ?T=+5.5?. The destiny of the final solution was 1.013ml-1 at 25?C, and the solution heat capacity was 4.08Jg-1deg-1. In a seperate experiment, the calorimeter constant was found to be 21 J deg-1. What was the molar concentration of the final NaOH solution at 25?C? What was the molar enthalpy of dissolution of NaOH in water?