Using standard enthalpies information, calculate the standard enthalpy change for this reaction.

a)(thermite reaction) 2Al(s) + Fe2O3(s) = Al2O3(s) + 2Fe(s)
b)Mg(OH)2(s) = MgO(s) + H2O(I)
c)N2O4(g) + 4H2(g) = N2(g) + 4H2O(g)
d)SiCl4(I) + 2H2O(I) = SiO2(s) + 4HCI(g)

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