Asked by jerson

How many moles of helium gas would it take to fill a balloon with a volume of 1000.0 cm^3 when the temp is 32 degrees C and the atmospheric pressure is 752 mm Hg
Answered by ~christina~
Convert temperature to celsius.

convert pressure to atmospheres.

convert volume to liters.

R=> gas constant.

use PV=nRT
P= pressure
V= volume
n= moles of gas
R= gas constant
T= temperature



Answered by DrBob222
PV = nRT
T in Kelvin.
P in atmospheres = 752/760
Answered by ~christina~
760mm Hg/1atm
Answered by jerson
so i divide 752 by 760 and that's it?
Answered by ~christina~
yes but the reason is the conversion factor is what I posted below Dr.Bob's comment to clarify on that.

thus

mmHg(760atm/mmHg)= atm
Answered by ~christina~
forget ABOVE....

CORECTION:

mmHg(1atm/760mmHg)= atm
Answered by jerson
and the answer is =760
Answered by DrBob222
No, of course not. Use
PV = nRT to solve the problem.
You have pressure BUT it must be converted to atmospheres. The way to do that is to divide 752 by 760. That number, then you substitute for P in the formula. Likewise, substitute the other numbers for the remaining parameters to solve for the n, the number of mols.
Answered by Anonymous
how do you mix stuff
Answered by ~christina~
no, and I hope the anonymous person is not being mean..

What I posted above was the conversion for one part of the question, jerson.

you convert the pressure (how I did it above, but using the numbers you have in the problem)

Analyzing your problem because it seems you don't understand below:

<b>How many moles of helium gas would it take to fill a balloon with a volume of 1000.0 cm^3 when the temp is 32 degrees C and the atmospheric pressure is 752 mm Hg </b>

your given,

Volume= 1000.0cm^3
Temperature= 32<sup>o</sup>C
Pressure= 752 mmHg
m= ?
R= 8.314472

PV=nRT

so the problem is that you need the same information but converted into other units, specifically

The above units need to be converted to:
Volume= L (noting 1cm^3= 1ml)
Temperature= Kelvin (noting C= K-273.15)
Pressure= 752 mmHg (noting 1atm= 760mmHg)
R= 8.314472

n=? (your looking for this)

PV=nRT
n= moles
rearranged equation is:

n=PV/RT

and AFTER you convert the numbers given to you in the question, plug them into the equation and solve for moles(I rearranged the equation for you already)

if you need help POST YOUR WORK
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