A first order reaction has t1/2 = 20 min. How long does 75% completion take?
A60 min
B80 min
C40 min
D30 min
Answer & Solution
Correct answer: C. 40 min
75% completion leaves one quarter of the reactant, which is two half-lives, so 2 x 20 = 40 min.
Related questions
Chemical equilibrium is reached whenWhich technique studies fast reactions by a sudden temperature or pressure change?The study of reactions initiated by light is calledCrushing a solid reactant speeds a reaction because itIn 1864 Waage and Guldberg published which law?Who received the first Nobel Prize in Chemistry in 1901 for laws of chemical dynamics?Who studied the inversion of sucrose in 1850, pioneering chemical kinetics?The number of collisions per second per unit volume of a reaction mixture is called