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A sample of helium behaves as an ideal gas as it is heated at constant pressure...

A sample of helium behaves as an ideal gas as it is heated at constant pressure from 253 K to 393 K. If 70 J of work is done by the gas during this process, what is the mass of the helium sample? The universal gas constant is 8.31451 J/mol · K. Answer in units of g.

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Answer #1

The work done by the ideal gas in a constant pressure expansion is
   
  
So, the number of moles in the gas is
   
So, putting the given values,
  
we get the number of moles in the gas
   
  
Now the molar mass of helium is
   
So, the mass of the helium sample is
   
  

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