At a certain temperature the rate of this reaction is first order in CICH₂CH₂CI

with a rate constant of 1.31 ¹

CICH₂CH₂CI (g) → CH₂CHCI (g) + HCI (g)

Suppose a vessel contains CICH₂CH₂CI at a concentration of 0.220M. Calculate

the concentration of CICH₂CH₂CI in the vessel 0.840 seconds later. You may

assume no other reaction is important.

Round your answer to 2 significant digits.

M

X

?

Ar