Consider the first-order reaction shown below. The yellow spheres represent the reactant, A. The blue spheres represent the product, B. AB Part 1 of 3 What is the rate constant of the reaction? Be sure your answer has the correct number of significant digits. How many A (yellow) and B (blue) molecules are present at t=14.0 s? Round your answer to the nearest whole number. yeliow molecules blue molecules Part 3 of 3 How many A (yellow) and B (blue) molecules are present at t=21.0 s? Round your answer to the nearest whole number. yellow molecules blue molecules