TMobile 1030 PM Chapter1 3ChandraCHEM1342Spring Alo moVL of

T-Mobile 10:30 PM Chapter1 3.Chandra.CHEM1342.Spring Alo moVL of A at time t0. IA mol/L of A at time t. k specific rate constant, t time elapsed since beginning of reaction 7 of 16 THE INTEGRATED RATE EQUATION HALF LIFE, FIRST-ORDER Cyclopropane, an anesthetic, decomposes to propene according to the following equation. The reaction is first order in cyclopropane with k 9.2 s-1 at 1000°C. Calculate the half life of cyclopropane at 1000°C. CH 2 (g) A. 0.075 s B. 0.109 s C. 6.4 s D. 7.5 s In [A]=-kt + ln(AL open with Print

Solution

1) half life of a first order reaction can be calculated by the formula :

t_1/2 = ln (2)/k = 0.693/k= 0.693/9.2 = 0.075 secs

2) initial concentration = 3 gms

time = 0.50 secs

k = 9.2/sec

t = (2.303/k) log (C₀/C₁) =

0.50 = (2.303/9.2) log (3/C₁)

2 = log (3/C₁)

C₁ = 0.03 gms