• Support PF! Buy your school textbooks, materials and every day products Here!

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
12,482
2,798
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
 
1,523
528
"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.
 
19,450
3,892
Does increasing the pressure cause the volume to decrease or increase?

Does decreasing the temperature cause the volume to decrease or increase?
 
1,523
528
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).
 
19,450
3,892
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.
 

Related Threads for: Combined gas law

Replies
3
Views
3K
Replies
1
Views
1K
  • Last Post
Replies
7
Views
8K
Replies
2
Views
3K
Replies
1
Views
409
  • Last Post
Replies
2
Views
866
Replies
7
Views
1K
Replies
0
Views
2K
Top