Calculate Mass of Balloon with PV=mRT

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To calculate the mass of a helium balloon with a volume of 6000 m^3 at 28 degrees C and 99 kPa, the ideal gas law equation PV = mRT is applicable. The value of R for helium can be determined by dividing 8.314 by the molecular weight of helium. The user expresses uncertainty about how to derive R and confirms the use of the ideal gas law for this scenario. Proper application of the equation will yield the mass of the balloon just before launch. Understanding the relationship between pressure, volume, temperature, and mass is crucial for solving this problem.
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Homework Statement


A balloon contains 6000m^3 of helium at 28 degrees C. and 99kPa absolute. Just before launch determine the mass of the balloon.


Homework Equations



Determine the mass of the balloon.


The Attempt at a Solution



I think you might have to use PV=mRT but I am not sure about how you would get R really. Any thoughts? Is that the right equation to use here?
 
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R = 8.314 / Molecular Weight of helium
 

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