Please show work!

For the following problems, assume that the volume of the final solution is 100.mL, the density of the solution is 1.00g/mL and the heat capacity of the solution is the same as water (4.184J/g. C). a) When 0.800g of Mg metal is added to 100mL of 0.500MHCl(aq) according to the method described in Procedure III a, a temperature increases from 22C to 37C Celsius is observed. What is Hrxn at room temperature for the reaction of Mg(s)+ 2H+(aq)? b) When 1.12g of MgO is added to 100mL of 0.500MHCl(aq) according to the method described in Procedure III b, a temperature increase from 22.3C to 26.4C is observed. What is Hrxn at room temperature for the reaction of : MgO(s)+2H+(aq) ? c) from the reaction: H2+1/2O2H2OHrxn=285.8KJ/mol. Calculate the enthalpy of the reaction: Mg+1/2O2MgO