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QJEEM21Ch1171: JEE Main 2021 Chemistry - Class 11 JEEM21Ch1171 Solution: The equilibrium constant K c at 298 K for the reaction A + B C…

The equilibrium constant Kc at 298 K for the reaction A + B ⇌\rightleftharpoons C + D is 100. Starting with an equimolar solution with concentrations of A, B, C and D all equal to 1M, the equilibrium concentration of D is ___________ ×\times 10 −- 2 M. (Nearest integer)

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JEE Main 2021 (Online) 26th August Evening Shift Chemistry - Chemical Equilibrium Question 44 English Explanation

∴\therefore KC=(1+x1−x)2{K_C} = {\left( {{{1 + x} \over {1 - x}}} \right)^2}

100=(1+x1−x)2100 = {\left( {{{1 + x} \over {1 - x}}} \right)^2}

1+x1−x=10{{1 + x} \over {1 - x}} = 10

x=911x = {9 \over {11}}

Moles of D = 1 + x

=1+911=2011= 1 + {9 \over {11}} = {{20} \over {11}}

=1.818=181.8×10−2=181.8×10−2= 1.818 = 181.8 \times {10^{ - 2}} = 181.8 \times {10^{ - 2}}

≅182×10−2\cong 182 \times {10^{ - 2}} M

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