[Violet89]

1. In a first order decomposition, how long does it take (in seconds) until 73% of the compound is left given that k is 0.0831 sec-1 (give answer to 3 sig figs using E notation)?

ln(100/27) = (0.0831)t
t = 15.8

2. In a first order decomposition, 78% of a compound decomposes in 98 minutes. What is the value of k for the reaction in min-1

ln(100/22) = -k(98)
k = -1.55E-2