Use bond enthalpy to estimate the enthalpy change for each of the following reactions: (a)H2C=O(g) + HCl(g) ---> H3C¬O¬Cl(g (b)H202(g)+2CO(g) ------->H2(g)+2CO2(g) (c)3 H2C=CH2(g) ----------> C6H12(g) (the six carbon atoms form a six-membered ring with two H atoms on each C atom)