Find ΔG∘rxn for the reaction?

Posted on 2017-04-20 19:31:00 in Chemistry by CASTIEL

Find ΔG∘rxn for the reaction 

4N2O(g)→3N2(g)+2NO2(g) 

Use the following reactions with known ΔG values: 

2NO(g)+ O2(g)→2NO2(g) ΔG∘rxn=−71.2 kJ 

N2(g)+O2(g)→2NO(g) ΔG∘rxn= +175.2 kJ 

2N2O(g)→2N2(g)+O2(g) ΔG∘rxn=−207.4 kJ 

Express the free energy change to four significant figures and include the appropriate units. 

When I do this problem, I keep the first reaction the same, flip the second one and multiply it by 3, and for the third I multiply by 2. When I add the changed ΔG∘rxn together, I end up getting -1012 kJ but masteringchem says this is wrong. Can somebody please help and explain what I'm doing wrong? Thanks!

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