Answer to Question #44400 in Chemistry for khaled

Question

1. Calculate the standard enthalpy change for the reaction:
C2H4(g) + H2(g)→C2H6(g)
given that the enthalpy of combustion
for the reactants and products are:
∆Hºc(C2H4)(g) = -1411 kJ mol^-1∆Hºc(C2H6)(g) = -1560 kJ mol^-1∆Hºc(H2)(g) = -286 kJ mol-1.

2. Calculate the enthalpy change of
combustion for ethene gas (C2H4) given the
following enthalpy changes of formation:
∆Hºf(C2H4)(g) = +52 kJ mol^-1∆Hºf(CO2)(g) = -394 kJ mol^-1
∆Hºf(H2O)(g) = -286 kJ mol^-1

3.Calculate the standard entr
opy change for the reaction:
N2+ 3H2→2NH3
given the standard entropies
Sº(N2)(g) = 191.6 J K^-1 mol^-1
Sº(H2)(g) = 130.6 J K^-1 mol^-1
Sº(NH3)(g) = 193.3 J K^-1 mol^-1