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Combined gas law

Homework Statement
1.1L volume O2 collected in balloon, at 295K, 13.6 psi.
next day... 32C, 0.98 atm
what is the volume in the balloon.

a) 0.107L
b) 1.07L
c) 10.7L
d) 107.0L
Homework Equations
pv/t = pv/t
1atm = 14.7psi
P1= 13.6 V1= 1.1 T1= 22 P2 = 14.4 V2= x T2 = 32
my answer is 1.51L

am i missing something? 
 

BvU

Science Advisor
Homework Helper
12,491
2,800
Yes, an explanation what the numbers represent. Hint: 22 is NOT T1 in your relevant equation.
 
Damn! I need to convert to Kelvin for gas problems, right
 
1,536
535
"13.6 psi" in the problem statement is ambiguous. Is that psia or psig? Doubly confusing since a "balloon" suggests pressure higher than ambient. You can work out the answer both ways and then see whether the available choices allow you to eliminate one possibility. I call that a crummy question.
 
19,469
3,895
Does increasing the pressure cause the volume to decrease or increase?

Does decreasing the temperature cause the volume to decrease or increase?
 
1,536
535
I got (b) 1.07 liter by assuming the 13.6 psi initial condition is psia. Also note, the initial volume is 1.1 liters; I missed that the first time thru (thinking it was 1 liters).
 
19,469
3,895
I got (b) 1.07 liter by assuming the 13.6 psi initial condition is psia. Also note, the initial volume is 1.1 liters; I missed that the first time thru (thinking it was 1 liters).
I also got 1.07 now. Initially I used 293 instead of 305 for some reason.
 
Last edited:
thanks for the answers, i am happy with what i have... i am now sure the question is designed to dilineate two levels of students, and so there's no need for me to progress further for now.
 

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