How to calculate volume of a gas at STP?

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SUMMARY

The volume of 0.250 g of helium (He) at Standard Temperature and Pressure (STP) can be calculated using the fact that one mole of gas occupies 22.4 liters. Given that the atomic mass of helium is approximately 4 g/mol, the number of moles in 0.250 g of helium is 0.0625 moles. Multiplying the number of moles by the volume occupied by one mole at STP (22.4 L) results in a volume of 1.4 liters for 0.250 g of helium.

PREREQUISITES
  • Understanding of the Ideal Gas Law
  • Knowledge of molar mass calculations
  • Familiarity with Standard Temperature and Pressure (STP) conditions
  • Basic arithmetic for unit conversions
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  • Learn how to calculate moles from mass using molar mass
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Students preparing for chemistry exams, educators teaching gas laws, and anyone needing to understand gas volume calculations at STP.

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Homework Statement


Calculate the volume of .250 g of helium at STP.
This seems so simple but I keep getting the wrong answers.
If someone could walk me through how to do this problem so I will know how to do them for our test. Our book doesn't give a good example.

Homework Equations



I know gasses occupy 22.4 L at STP but other then that... I'm not sure how to set up this equation

The Attempt at a Solution

 
Last edited:
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Mackydoodle said:

Homework Statement


Calculate the volume of .250 g of helium at STP.
This seems so simple but I keep getting the wrong answers.
If someone could walk me through how to do this problem so I will know how to do them for our test. Our book doesn't give a good example.


Homework Equations



I know gasses occupy 22.4 L at STP but other then that... I'm not sure how to set up this equation

The Attempt at a Solution


More exactly a mole of gas occupies 22.4 L .
So how many moles is 0.25g of He? You can take the atomic mass to be 4.
Moles and atomic mass have got to be in your book so I won't come back on this.
 

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