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Chemistry Question on Thermodynamics

For which one of the following equations is ∆Hºreact equal to ∆Hºf for the product:

A

N2(g)+O3(g)→N2O3(g)N_2(g)+O_3(g)→N_2O_3(g)

B

CH4(g)+2Cl2(g)→CH2Cl2(l)+2HCl(g)CH_4(g)+2Cl_2(g)→CH_2Cl_2(l)+2HCl(g)

C

Xe(g)+2F2(g)→XeF4(g)Xe(g)+2F_2(g)→XeF_4(g)

D

2CO(g)+O2(g)→2CO2(g)2CO(g)+O_2(g)→2CO_2(g)

Answer

Xe(g)+2F2(g)→XeF4(g)Xe(g)+2F_2(g)→XeF_4(g)

Explanation

Solution

In this equation, the reactants (Xe and F2) are in their standard states, and the product (XeF4) is also in its standard state, making ∆Hºreact equal to ∆Hºf for XeF4.

So, the correct option is (C): Xe(g)+2F2(g)→XeF4(g)Xe(g)+2F_2(g)→XeF_4(g)