1 The reactant concentration in a firstorder reaction was 90

1) The reactant concentration in a first-order reaction was 9.00

1st order reaction

ln(Ca0/Ca) = Kt

ln(Ca0) = K*15 - 2.41

ln(Ca0) = K*100 - 5.4

K*15 - 2.41 = K*100 - 5.4

85K = 2.99

k= 0.035 sec^-1

2nd order

1/Ca - 1/Ca0 = kt

1/Ca0 = 1/Ca - kt

1/Ca0 = = 1/0.33 - 140*K

1/Ca0 = = 1/0.015 - 840*K

1/0.33 - 140*K = 1/0.015 - 840*K

700K = 700/11

k = 1/11 = 0.0909 L* mol^{?1 *}s^?1