How to Calculate the Number of Moles in a Gas Using the Ideal Gas Law?

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SUMMARY

The discussion centers on calculating the number of moles of gas using the Ideal Gas Law. The scenario involves a gas in a 7.71-liter vessel at a temperature of 18.6°C and a pressure of 8.35 atm. The Ideal Gas Law formula, PV = nRT, is essential for this calculation, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature in Kelvin. Participants emphasize the importance of converting temperature to Kelvin and using the correct value for R, which is 0.0821 L·atm/(K·mol).

PREREQUISITES
  • Understanding of the Ideal Gas Law (PV = nRT)
  • Ability to convert temperature from Celsius to Kelvin
  • Knowledge of the ideal gas constant (R = 0.0821 L·atm/(K·mol))
  • Familiarity with unit conversions (liters to moles)
NEXT STEPS
  • Learn how to convert Celsius to Kelvin for gas law calculations
  • Study the Ideal Gas Law in-depth, including its applications
  • Explore the concept of molecular mass and its relevance in gas calculations
  • Practice solving problems using the Ideal Gas Law with varying conditions
USEFUL FOR

Students in chemistry, educators teaching gas laws, and anyone needing to apply the Ideal Gas Law for practical calculations in gas behavior.

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Homework Statement


Gas is contained in an 7.71 liter vessel at a temperature of 18.6oC and a pressure of 8.35 atm. Determine the number of moles of gas in the vessel.


Homework Equations



1 mol= 6.03 x 10^23

# of moles= mass of the gas/molecular mass

The Attempt at a Solution



I converted Liters to grams, which would make it 7,710 grams, but I'm not sure how to find the molecular mass of the gas, when just given the temperature and the pressure.
 
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welcome to PF!

Right now you have a volume, a temperature, and a pressure, and you want to find number of moles. is it possible that you are overseeing a formula?
 
oh, the Ideal gas law!
 

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