In a closed system for the reaction: A (g) + 2B (g) → AB₂ (g) The rate of the reaction increases when there is A) an increase in pressure
B) an increase in the reaction vessel
C) a decrease in the concentration of A
D) an increase in surface area of A

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.