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I am trying to calculate the gas formation volume factor for a reservior, however I am stuck when trying to find the value n - number of moles for a gas to plug into the equation to find Bg, this is what I know;

Bg (gas FVF)= volume of gas at reservoir conditions / volume of gas at standard conditions, I know I have to apply the real gas law here i.e PV=znrt = V=znrt/p, I have the following knowns;

z=0.81

n=??

R=10.73 psia ft3 / lb mol Deg R

T=580 deg R

P=2195 psia

Zsc=0.99

n=??

R= as above

Tsc= 520 deg R

Psc = 14.7 psia

Volume %

methane 83.4

Ethane 9.8

Propane 4.5

isobutane 1.4

n-butane

I am completely stuck when trying to find n, as I do not know the gas volume (only in %)or the gas weight, I know n=total gas weight / molecular weight, I have tried to work this out by calculating the gas density but I can not progress further than this, I am completely stuck!

Is there any guidance you can offer me on this?

2. Relevant equations

3. The attempt at a solution

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# Homework Help: How to calculate number of moles and gas formation volume factor?

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