Answered>Order 5223

Which of the following reactions would result in the transfer of thermal energy (heat) to the system and pressure-volume System doing work on surroundings?

            (1) 2H2O(l) + O2(g)  ?   2H2O2(l)                                     ?H = +196 kJ/mol

            (2)  4Al(s) + 3O2(g)   ?  2Al2O3(s)                                      ?H = ?3352 kJ/mol

            (3) 3S(s) + 2H2O(l)   ?   2H2S(g) + SO2(g)                      ?H = +233 kJ/mol

            (4) N2(g)  + 4H2O(g)   ?    N2H4(l) + 2H2O2(l)                  ?H = +642.2 kJ/mol

            (5) N2(g)  +  3H2(g)      ?     2NH3(g)                                  ?H = -93 kJ/mol