Posted by Hannah on .
The decomposition of sulfuryl chloride (SO2Cl2) is a firstorder process. The rate constant for the decomposition at 660 K is 4.5 102 s1.
(a) If we begin with an initial SO2Cl2 pressure of 425 torr, what is the pressure of this substance after 74 s?
what is the equation to solve this?

chem 
DrBob222,
ln(Po/P) = kt
Po = initial P
P = final P. Solve for this.
k = given
t = given 
chem 
Hannah,
i got 11873 which seems kinda high..?

chem 
Hannah,
is k negative because of the s1?
without making it negative i got 15.21 which seemed more reasonable but when i plugged it in it was wrong 
chem 
DrBob222,
k is not negative.
I obtained 15.23. How is the problem stated? If k = 4.50E2 then you are allowed three significant figures and you should report 15.2 and the data base is counting it wrong because you are using too many places. If k = 4.5E2 you are allowed only two significant figures and you should report 15. 
chem 
Hannah,
i just tried that and it is wrong.

chem 
Hannah,
does the temperature it gives have anything to do with the problem?

chem 
DrBob222,
The correct answer is 15 torr.
Does the problem as for P in torr or some other unit? 
chem 
Hannah,
torr