Exam 2- Form B CHEM 246 Spring 2016 Short Answer ease answer the following quest

Question

Exam 2- Form B CHEM 246 Spring 2016 Short Answer ease answer the following questions. Do not forget to use proper significant figures and units. Partio credit may be awarded but you must show your work 16. Carbon tetrachloride can be produced by the following reaction 2 CH2Cl2(g) = CH4(g) + CC14(g) Suppose 0.532 mol of CH2Ch was placed in a 1.00 L flask. After equilibrium has been achieved, the mixture contains 0.239 mol of CCla. Calculate Ke (10 points) ke S3u mol 98 3024 kc: .24742 17. A solution is prepared by dissolving 4.59 x 10 mol of benzoic acid 17. A solution is prepared by disoving 4.59 10 mol of benzoic acid, C 10L of water At equilibrium the nH of the solution is 3.29, what is the K. of benzoic acid?

Explanation / Answer

16) 2CH2Cl2(g) <----> CH4(g) + CCl4(g)

Initially, CH2Cl2 = 0.532 M ; [CH4] = [CCl4] = 0 M

Let at eqb., CH2Cl2 = (0.532-2x) M ; [CH4] = [CCl4] = x M

Given :- at eqb. [CCl4] = 0.239 M = x

Thus, Kc = {[CCl4]*[CH4]}/[CH2Cl2]2 = x2/(0.532-2x)2 = 0.6654

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