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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEC
Chapter: Chemical Equilibrium

Olympiad workbook · NSEC · Chemical Equilibrium

The equilibrium constant (K_ c ) for trimerization of phenyl...

The equilibrium constant

\left(\mathrm{K}_{\mathrm{c}}\right)

for trimerization of phenyl acetylene to triphenyl benzene is 3.0 at 310 K . If at equilibrium,

0.9 \mathrm{~mol} \mathrm{dm}^{-3}

of triphenyl benzene is present, concentration of phenyl acetylene at equilibrium is:

Options

A $1 / 3 \mathrm{~mol} \mathrm{dm}^{-3}$
B $3.0 \mathrm{~mol} \mathrm{dm}^{-3}$
C $1.732 \mathrm{~mol} \mathrm{dm}^{-3}$
D $0.67 \mathrm{~mol} \mathrm{dm}^{-3}$

Correct answer

D. $0.67 \mathrm{~mol} \mathrm{dm}^{-3}$

Step-by-step solution

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