For a reaction, a plot of ln K versus inverse temperature is found to be linear and fits the following equation: y = - 1,498x + 7.14. What is the value of ΔH? Give your answer with units of kJ/molK; however, you should not type in the units

Question

Chemistry

Ford

30 November, 00:04

For a reaction, a plot of ln K versus inverse temperature is found to be linear and fits the following equation: y = - 1,498x + 7.14. What is the value of ΔH? Give your answer with units of kJ/molK; however, you should not type in the units

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Answers (1)

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Layne Gross · Answer 1

12.455 KJ/molK = ΔH

Explanation:

One way to write Van't Hoff equation is:

lnK = - ΔH / RT + ΔS/R

Where R is gas constant (8.314472 J/molK)

The graph of lnK vs 1/T has as slope - ΔH / R and as intercept ΔS/R

If in the graph you obtain the equation:

y = - 1,498x + 7.14

-1,498 = - ΔH / R

-1,498*8.314472J/molK = - ΔH

12455 J/molK = ΔH

12.455 KJ/molK = ΔH