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Question: For a reaction \(R \rightarrow P\), the concentration of a reactant changes from \(0.05M\) to \(0.04...

For a reaction R→PR \rightarrow P, the concentration of a reactant changes from 0.05M0.05M to 0.04M0.04M in 30 minutes. What will be the average rate of reaction in minutes?

A

4×10−4Mmin⁡−14 \times 10^{- 4}M\min^{- 1}{}

B

8×10−4Mmin⁡−18 \times 10^{- 4}M\min^{- 1}{}

C

3.3×10−4Mmin⁡−13.3 \times 10^{- 4}M\min^{- 1}{}

D

2.2×10−4Mmin⁡−12.2 \times 10^{- 4}M\min^{- 1}{}

Answer

3.3×10−4Mmin⁡−13.3 \times 10^{- 4}M\min^{- 1}{}

Explanation

Solution

Average rate =−Δ[R]Δt=−([R]−[R]1)t2−t1= - \frac{\Delta\lbrack R\rbrack}{\Delta t} = - \frac{(\lbrack R\rbrack - \lbrack R\rbrack_{1})}{t_{2} - t_{1}}

=−(0.04−0.05)30=0.0130=3.3×10−4Mmin⁡−1= - \frac{(0.04 - 0.05)}{30} = \frac{0.01}{30} = 3.3 \times 10^{- 4}M\min^{- 1}{}