Using the supplemental data, calculate the standard enthalpy change (in kj/mol) for each of the following reactions. (a) 2 na(s) + i2(g) → 2 nai(s) kj/mol (b) 2 koh(s) + co2(g) → k2co3(s) + h2o(g) kj/mol (c) b2o3(s) + 3 h2(g) → 2 b(s) + 3 h2o(l) kj/mol (d) ni(s) + cl2(g) → nicl2(s) kj/mol