Question

In the presence of acid, the initial concentration of cane sugar was reduced from 0.2 M to 0.1 Min 5 hours and to 0.05 Min 10 hours. The reaction must be of?

Options

• Zero order

• Second order

• First order

• Fractional order

Answer 1

First order

Explanation:

Initial concentration a = 0.2 M

Given a = \[\ce{\underset{\underset{t_{1/2} = 5 hr}{5 hr}}{0.2 M -> 0.1 M} -> \underset{\underset{t_{1/2} = 5 hr}{5 hr}}{0.05 M}}\]

Which indicates that the reaction must be of first order.