a) Calculate the standard enthalpy of reaction 4 using the given data: A ( g ) + X 2 ( g ) ⟶ A X 2 ( g ) ΔfHo = - 393.5 kJ/mol reaction 1 M ( s ) + X 2 ( g ) ⟶ M X 2 ( g ) ΔfHo = - 296.8 kJ/mol reaction 2 A ( g ) + 2 M ( s ) ⟶ A M 2 ( l ) ΔfHo = +87.9 kJ/mol reaction 3 A M 2 ( l ) + 3 X 2 ( g ) ⟶ A X 2 ( g ) + 2 M X 2 ( g ) ΔrHo = ??? reaction 4 b) How does the change in enthalpy compare to the change in internal energy for reaction 4 in part a? Treat all gaseous species as ideal. Note that you are not required to do any calculations for this problem, but you can do so if you wish.
a) Calculate the standard enthalpy of reaction 4 using the given data:
A ( g ) + X 2 ( g ) ⟶ A X 2 ( g ) ΔfHo = - 393.5 kJ/mol reaction 1
M ( s ) + X 2 ( g ) ⟶ M X 2 ( g ) ΔfHo = - 296.8 kJ/mol reaction 2
A ( g ) + 2 M ( s ) ⟶ A M 2 ( l ) ΔfHo = +87.9 kJ/mol reaction 3
A M 2 ( l ) + 3 X 2 ( g ) ⟶ A X 2 ( g ) + 2 M X 2 ( g ) ΔrHo = ??? reaction 4
b) How does the change in enthalpy compare to the change in internal energy for reaction 4 in part a? Treat all gaseous species as ideal. Note that you are not required to do any calculations for this problem, but you can do so if you wish.
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