Homework Help: chem

Posted by Hannah on Saturday, February 2, 2013 at 3:46pm.

The decomposition of sulfuryl chloride (SO2Cl2) is a first-order process. The rate constant for the decomposition at 660 K is 4.5 10-2 s-1.

(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, Saturday, February 2, 2013 at 3:58pm
ln(Po/P) = kt
Po = initial P
P = final P. Solve for this.
k = given
t = given
chem - Hannah, Saturday, February 2, 2013 at 4:11pm
i got 11873 which seems kinda high..?
chem - Hannah, Saturday, February 2, 2013 at 4:12pm
is k negative because of the s-1?

without making it negative i got 15.21 which seemed more reasonable but when i plugged it in it was wrong
chem - DrBob222, Saturday, February 2, 2013 at 4:24pm
k is not negative.
I obtained 15.23. How is the problem stated? If k = 4.50E-2 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 = 4.5E-2 you are allowed only two significant figures and you should report 15.
chem - Hannah, Saturday, February 2, 2013 at 4:26pm
i just tried that and it is wrong.
chem - Hannah, Saturday, February 2, 2013 at 4:27pm
does the temperature it gives have anything to do with the problem?
chem - DrBob222, Saturday, February 2, 2013 at 4:42pm
The correct answer is 15 torr.
Does the problem as for P in torr or some other unit?
chem - Hannah, Saturday, February 2, 2013 at 4:52pm
torr

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