The rate constant for this first-order reaction is 0.0285s1 at 300C. Aproducts If the initial mass of A is 18.19g, calculate the mass of A remaining after 1.12min. mass of A: The National Institute of Science and Technology (NIST) kinetics database lists the rate constant, k, of a particular gaseous reaction as 1.891010cm3 molecule 1s1 at 298K. Convert the rate constant to units of M1s1. k incorrect Convert the rate constant to units of Torr 1s1. k