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R=0.08214 L(atm)/mol(K)

and you know the rest of the values... so make sure you have the right units and solve for n

n= 9*8/(0.08214*20)



part a found the number of moles, so just use Avagadro's number, which is the number of atoms or molecules in a mole


that will give you the molecules of gas in the vessel

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Q: Gas is contained in an 8.0-L vessel at a temperature of 20C and a pressure of 9.0 ATM a Determine the number of moles of gas in the vessel b How many molecules are in the vessel?
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