hess law!!?

1 ⤊

Given the following data:
PCl5(s) → PCl3(l) + Cl2(g) ΔH = +123.8 kJ
4PCl3(l) → P4(s) + 6Cl2(s) ΔH = +1278.8 kJ

Find the ΔH of the following reaction:
P4(s) + 10Cl2(g) → 4PCl5(s)

2007-10-15 05:36:28 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry

2 answers

http://en.wikipedia.org/wiki/Hess's_Law

2007-10-15 05:41:20 · answer #1 · answered by Loren S 7 · 1⤊ 0⤋

-1278.8 - 4*123.8 = -1278.8 - 495.2 = -1773 kJ

2007-10-15 06:00:40 · answer #2 · answered by ag_iitkgp 7 · 0⤊ 0⤋