ThermochemistryHard

Question

NH3(g) + 3Cl2(g) → NCl3(g) + 3HCl(g) ;          ᐃH1
N2(g) + 3H2(g) → 2NH3(g) ;                           ᐃH2
H2(g) + Cl2(g) → 2HCl(g) ;                              ᐃH3
The heat of formation of NCl3(g) in the terms of ᐃH1, ᐃH2 and ᐃH3 is

Options

A.ᐃHf = - ᐃH1 + ᐃH3
B.ᐃHf = ᐃH1 + ᐃH3
C.ᐃHf = ᐃH1 - ᐃH3
D.None

Solution

N2(g) + Cl2(g) → NCl3(g)
ᐃH = - ᐃH1 + ᐃH3

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