Consider the problem below: (Equation 1) 2 H2O(l) ---> 2 H2(g) + O2(g) ΔH = 571.6 kJ (Equation 2) N2O5(g) + H2O(l) ---> 2 HNO3(l) ΔH = -73.7 kJ (Equation 3) 2 H2(g) + 6 O2(g) + 2 N2(g) ---> 4 HNO3(l) ΔH = -696.4 kJ (Equation 4) 2 N2(g) + 5 O2(g) ---> 2 N2O5(g) ΔH = ??????? To find ΔH for equation 4 you must:

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Consider the problem below:

(Equation 1) 2 H2O(l) ---> 2 H2(g) + O2(g) ΔH = 571.6 kJ

(Equation 2) N2O5(g) + H2O(l) ---> 2 HNO3(l) ΔH = -73.7 kJ

(Equation 3) 2 H2(g) + 6 O2(g) + 2 N2(g) ---> 4 HNO3(l) ΔH = -696.4 kJ

(Equation 4) 2 N2(g) + 5 O2(g) ---> 2 N2O5(g) ΔH = ???????

To find ΔH for equation 4 you must:

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