For the reaction , of and of are initially placed in a flask. At a certain time , the concentration — Chemical Equilibrium Chemistry Question
Question
For the reaction $A(g) + B(g) \rightleftharpoons C(g) + D(g)$, $1\text{ mole}$ of $A$ and $1\text{ mole}$ of $B$ are initially placed in a $1\text{ L}$ flask. At a certain time $t$, the concentration of $C$ is found to be $0.4\text{ M}$. What is the value of $Q_c$ at this instant?
Answer: A
💡 Solution & Explanation
At time $t$, $0.4\text{ M}$ of $C$ is formed, so $0.4\text{ M}$ of $D$ is also formed. Reactants $A$ and $B$ consumed are $0.4\text{ M}$ each. $[A]=1-0.4=0.6\text{ M}$, $[B]=0.6\text{ M}$. $Q_c = ([C][D])/([A][B]) = (0.4 \times 0.4)/(0.6 \times 0.6) = 0.16/0.36 = 16/36 = 4/9$.
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