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  3. 2 reacts with the halogens (x2) according to the f

2 reacts with the halogens (X2) according to the following reaction: H2(g)+X2(g)?2HX(g) where X2 can be Cl2, Br2,...

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Chemistry

2 reacts with the halogens (X2) according to the followingreaction:
H2(g)+X2(g)?2HX(g)
where X2 can be Cl2, Br2, or I2.

Reactant/Product?H?f(kJ/mol)?S?f(J/mol?K)
H2(g)0130.7
Cl2(g)0223.1
HCl(g)-92.3186.9
Br2(g)30.9245.5
HBr(g)-36.3198.7
I2(g)62.42260.69
HI(g)26.5206.6

Assuming deltaGo for the reaction betweenhydrogen and Cl2 is -190.46 kJ calculate Kp for thereaction between hydrogen and Cl2.

Answer & Explanation Solved by verified expert
3.6 Ratings (590 Votes)

Frist let us calculate the delta H and delta S for the reaction by using the relation,

delta Hreaction = delta Hproducts - delta Hreactants

                         = 2 x -92.3 - (0 + 0)

                         = -184.6 kJ/mol

delta Sreaction = delta Sproducts - delta Sreactants

                         = 2 x 186.9 - (130.7 + 223.1)

                         = 20 kJ/mol.K

We know, delta Greaction = delta Hreaction - T x delta Sreaction

                -190.46 = -184.6 - (T x 20)

or T = 0.293 K

Now, delta G = -RT lnKp

-190.46 = -(8.314 x 0.293) ln Kp

Kp = 9.03 x 10^33
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