When 5.0 grams of sodium is placed into 100. mL of water, the temperature of the solution increases by 7.0C as shown in following reactions Na(s) + H2O(1) NaOH(aq) + 1/2 H2 (aq). (i) Calculate AHrxn/mol of Na. (2 marks) (ii) Assume density and specific heat capacity of the solution to be same as water. (3 marks) Given a reaction as below Ba(s) + 2HCl (aq) BaCl2 (aq) + H2 (g) If 2.5 grams of calcium is placed into 70 mL of 1.0M HCl solution at 16C and the final temperature of the system reaches 21C, calculate AHrxn/mole Ba. Assume density and specific heat capacity of the solution to be same as water