Solution-
A---> 3B
2-x .......(3x)
Therefore
Kc = (3x)^3/(2-x)
9.88*10^-6 = (3x)^3/(2-x)
=>3x^3= 1.98*10^-5 -9.88*10^-6x
=> 3x^3+ (9.88*10^-6)x - 1.98*10^-5=0
solving the above equation we get
x = 0.0187
Therefore;
[B] = 3x = 3* 0.0187
[B] = 0.0561 M
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