Question

please help!!

The reaction A B +C is zero order with respect to A. When (Alo -0.710 M, the reaction is 30.0 % complete at 72.2 min. Calculate the half-life for this reaction. Enter an integer or decimal number with exactly significant forures more. 1

Answer 1

first calculate K from given data

[A]₀ - [A] = K₀t  

[A₀] = 0.710 M

30 % complete

70 % left

70 = (X / 0.710) x 100

0.70 = X / 0.710

X = 0.497

so [A ] = 0.497 M

0.710 - 0.497 = K x 72.2

0.213 = K x 72.2

K = 0.0029 min^-1

now

for zero order

t_1/2 = [A₀] / 2 K₀

t_1/2 = 0.710 / 2 x 0.0029

t_1/2 = 0.710 / 0.0058

t_1/2 = 122 min