Consider the following reaction
`2N_(2)O_(5)iff 4NO_(2)+O_(2)`.
If rate and rate constant for above reaction are `2.40 xx 10^(-5)` mol `L^(-1) s^(-1)` and `3 xx 10^(-5) s^(-1)` respectively, then calculate the concentration of `N_(2)O_(5)`.

Options

A. 1.4
B. 1.2
C. 0.04
D. 0.8

Answer

D

Explanation

The reaction is of first order and for a first order reaction,
Rate, `R = k[N_2O_5]`
`2.4 xx 10^(-5) xx 3 xx 10^(-5) xx [N_2O_5]`
`[N_2O_5] = (2.4 xx 10^(-5))/(3 xx 10^(-5))`
`= 0.8 mol L^(-1)`