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Molar Volume at STP 4 questions

Molar Volume at STP

New Regents original practice • Name: ____________________ Date: __________ Show your work for written answers.

At STP, one mole of an ideal gas occupies 22.4 L in the model given in the 2025 Chemistry Reference Tables.

Question 1

What volume does 0.500 mol of an ideal gas occupy at STP?

  1. 5.60 L
  2. 11.2 L
  3. 22.4 L
  4. 44.8 L

Question 2

How many moles of ideal gas occupy 33.6 L at STP? Show your conversion.

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Question 3

Which pair of conditions is STP according to the 2025 tables?

  1. 0.00 K and 1.00 atm
  2. 273.15 K and 1.00 atm
  3. 273.15 K and 2.00 atm
  4. 298.15 K and 1.00 atm

Question 4

One mole of helium and one mole of neon occupy the same volume at STP in the ideal model. Explain why their masses still differ.

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Comparing Gas Samples 4 questions

Comparing Gas Samples

Use the information below to answer the questions.

A model compares three ideal-gas samples at 273.15 K. Use both the measured volume and the listed pressure before applying the STP relationship.

SampleGasVolume (L)Pressure (atm)
ANeon11.21.00
BHelium44.81.00
CNeon11.22.00

Question 5

Which samples are at STP?

  1. A and B
  2. A and C
  3. B and C
  4. A, B, and C

Question 6

Calculate the amount of gas in each of A and B. Include units.

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Question 7

A student assigns the same amount of gas to A and C because both volumes are 11.2 L. Use the pressures to explain why that conclusion is incorrect.

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Question 8

If sample C is allowed to reach 1.00 atm at the same temperature and amount of gas, what volume will it occupy?

  1. 5.60 L
  2. 11.2 L
  3. 16.8 L
  4. 22.4 L

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