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Hess’s Law Problem: Show your work neatly and methodically. 1. From the enthalpies of reaction PUT...

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Chemistry

Hess’s Law Problem: Show your work neatly and methodically.

1. From the enthalpies of reaction PUT *** BY ANY REACTIONS THATCORRESPOND IN A ΔH FORMATION

H2(g) + F2(g) ---->2 HF(g) ΔH = -537 kJ

C(s) + 2 F2(g)----> CF4(g) ΔH = -680 kJ

2 C(s) + 2 H2(g)------> C2H4(g) ΔH = +52.3 kJ

Calculate ΔH for the reaction of ethylene with F2:

C2H4(g) + 6 F2(g) ----> 2 CF4(g) + 4 HF(g) ΔHRXN = ????

2.Use Hess’s Law to calculate ΔH for the reaction

NO(g) + O(g) ---> NO2(g) given the following information:

NO(g) + O3(g) ---> NO2(g) + O2(g) ΔH = -198.9 kJ

O3(g) ----> 1.5 O2(g) ΔH = -142.3 kJ

O2(g) ---> 2 O(g) ΔH = +495.0 kJ

3.Use Hess’s Law to calculate ΔH for the reaction N2O(g) +NO2(g) ----> 3 NO(g) given the following information:

2 NO(g) + O2(g) ----> 2 NO2(g) ΔH = -113.1 kJ

N2(g) + O2(g) ----> 2 NO(g) ΔH = +180.7 kJ

2 N2O(g) -----> 2 N2(g) + O2(g) ΔH = -163.2 kJ

Answer & Explanation Solved by verified expert
3.9 Ratings (579 Votes)
1 consider the given reactions a H2 F2 2HF b C 2F2 CF4 c 2C 2H2 C2H4 d C2H4 6F2 2CF4 4HF we can see that eq d 2 x eq a 2 x eq b    See Answer
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