Hydrogen iodide decomposes at 800 K via a second-order process to produce hydrogen and iodine according to the following chemical equation. 2 HI(g) ---> H2 (g) + I2 g) At 800 K it takes 142 seconds for the initial concentration of HI to decrease from 6.75 x 10^-2 M to 3.50 x 10^-2 M. What is the rate constant for the reaction at this temperature?

A) 5.12 x 10^-4 M^-1 s^-1
B) 9.69 x 10^-2 M^-1 s^-1
C) 10.3 M^-1 s^-1
D) 1.95 x 10^3 M^-1 s^-1

Plz mark brainliest 30 points 1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s. 2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?

How much carbon is stored in the atmosphere as co2

Which conclusion fits the data in the table? a. heat chemically changes chocolate and margarine. b. all solids become liquid at 100°f. c. removing heat from a substance it to melt. d. matter may change shape when it is heated.