A zero order reaction has k = 3.6x10^-3 M s^-1 and [A]_0 = 1.20 M. Calculate [A] after 4.5 min in units of 10^-2 M (two decimals).

JEE Main levelNumerical answerDifficulty 2 of 3ck040

A zero order reaction has $k = 3.6 \times 1 0^{- 3} M s^{- 1}$ and $[A]_{0} = 1.20 M$ . Calculate $[A]$ after $4.5 min$ in units of $1 0^{- 2} M$ (two decimals).

Numerical answer type, answer in 10^-2 M, tolerance 0.02.

Convert the time to seconds:

4.5 \times 60 = 270 s

. Zero order:

[A] = [A]_{0} - k t = 1.20 - 3.6 \times 1 0^{- 3} \times 270 = 0.228 M

, i.e.

22.80 \times 1 0^{- 2}

. The reactant is not yet exhausted, so the formula holds.