According to the `Cr_(2)O_(7)^(2-)+5H^(+)+3HNO_(2)` →`2Cr ^ (3+) +3NO_ (3)^(−)+4H_(2) O`
The rate of disappearance of `Cr_(2)O_(7)^(2-)` is found to be `2.4 xx10^(-4)` mol `L^(-1) S^(-1)` find the rate of appearance of `Cr^(3+)` during given time interval

Options

A. `4.8 xx10^(-4) mol L^(-1) s^(-1)`
B. `5.9 xx10^(-4) mol L^(-1) s^(-1)`
C. `6.2 xx10^(-4) mol L^(-1) S^(-1)`
D. `9.5 xx10^(-4) mol L^(-1) s^(-1)`

Answer

A

Explanation

The rate of disappearance of `Cr_(2)O_(7)^(2)` is related to the rate of appearance of `Cr^(3+)` by the expression
`d[Cr_(2)O_(7)^(2-))/(dt)]=+1/2 (d[Cr^(3+))]/(dt) rarr +(d[Cr^(3+))]/(dt)=2xx2.4 xx10^(-4)=4.8 xx10^(-4) mol L^(-1) s^(-1)`