File Edit View History Bookmarks Tools Help L, University of Kentucky - c × e Ch

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File Edit View History Bookmarks Tools Help L, University of Kentucky - c × e Chegg Study | Guided Sol × € www.saplinglearning.com/ibiscms/mod/ibis/view.php?id=2702335 CSearch 07/2/2016 11:55 PM 84.8/1007/1/2016 12:29 PM Gradebook Assignment Information Available Fo 6/14/2016 12:00 AM Due Date Points Possible 100 Grade Category: Homework Description: Policies Attempts Score Print Calculator Periadic Table 100 Question 13 of 15 7/2/2016 11:55 PM 2 Map Sapling Learning macmilan learning 100 At a certain temperature, 0.960 mol of SO3 is placed in a 2.00-L container 90 2So Homework 100 At equilibrium, 0.160 mol of O2 is present. Calculate Kc You can check your answers. 98 You can view solutions when you complete or give up on any question Number 100 You can keep trying to answer each question until 100 Tools you get it right or give up. 9 90 You lose 5% of the points available to each answer in your question for each incorrect attempt at that answer 10 100 100 eTextbook Help With This Topic Web Help & Videos Technical Support and Bug Reports 12 95 13 4 14 100 Previous Give Up & View Solution O Check Answer Next Exit 15 100 Hint C 11 9:58 PM T 49 7/2/2016

Explanation / Answer

first find the concentration

concentration no of moles / volume in liters

[SO3] = 0.96 mol / 2 L

= 0.48M

[O2] = 0.16 mol / 2L

= 0.08M

construct the ICE table

2SO3 <====> 2SO2 + O2

I 0.48 0 0

C -2x +2x +x

E 0.48-2x +2x +x

but he has given equilibrium concentration

[O2] = 0.08 = x

use this x value find the equilibrium concentrations of SO3 and SO2

[SO3] = 0.48-2x = 0.48 - 2(0.08) = 0.48 - 0.16 = 0.32 M

[SO2] = 2x = 2x0.08 = 0.16 M

now we have all the equilibrium concentration values plug in the above equation

Kc = [SO2]2 [O2] / [SO3]2

Kc =  [0.16]2 [0.08] / [0.32]2

Kc = 0.002048/ 0.1024

Kc = 0.02 or

Kc = 2 x 10-2

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