When 9.55 g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee-cup calorimeter, the temperature rises from 23.60 ºC to 47.40 ºC. Assume that the specific heat of the solution is the same as that of pure water. Calculate the ?H in kJ/mol NaOH for the solution process:
NaOH (s) ? Na+ (aq) + OH- (aq)
Write a balanced chemical equation for the combustion of propane gas (C3H8). C3H8 + 5O2 ---> 3CO2 + 4H2O