Introduction to Equilibrium Item 4 4 of 16 Part A The reversible chemical reacti

Question

Introduction to Equilibrium Item 4 4 of 16 Part A The reversible chemical reaction A (aq) + B(aq) C(ag) + D(ag) Initially, only A and B are present each at 2.00 mol L1 What is the final concentration of A once equilibrium is reached? Express your answer to two significant figures and include the appropriate units. has the following equilibrium constant View Available Hint(s) K-EP = 1.8 AB [A] = 0.85 m101-L-1 Correct Part B What is the final concentration of D at equilibrium if the initial concentrations are [A]-1.00 mol L- and B] 200 mol L l 2 Express your answer to two significant figures and include the appropriate units. View Available Hint(s) D-aue Units Submit Provide Feedback

Explanation / Answer

Question number (1)

Solution :-

a)

A   + B    ßà C   +   D

2      2           0      0

2-x     2-x         x       x

Kc = x^2 / (2-x)^2

1.8 = (x/(2-x))^2

x/(2-x) = sqrt (1.8)

x/(2-x) = 1.342

x = 2.684 – 1.342x

2.342x = 2.684

x = 1.146 M

[A] = 2-x = 2 – 1.146 = 0.854 M

Answer: 0.854M

b)

A   + B    ßà C   +   D

1      2           0      0

1-x     2-x         x       x

Kc = x^2 / (2-x)(1-x)

1.8= x^2 / (2-3x+x^2)

0.8x^2 – 5.4x + 3.6 = 0

solving above quadratic equation we get,

x = 6 and x=- 0.75

x can’t be -0.75 as it will make concentration of A and B negative

so,

x = 6M

[D] = 6 M

Answer: 0.87 M

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