juanverdin4262 juanverdin4262 29-02-2024 Physics contestada For a first-order reaction, after 2.00 half-lives, 20% of the reactants remain. Calculate the rate constant for the reaction.a. k=ln(0.2) /2b. k=ln(0.2) /4c. k=ln(0.8) /2d. k=ln(0.8) /4