Explanation:

This problem can be solved by using the ideal gas equation. The formula is

where:

P = pressure

V = volume

n = number of moles

R = universal gas constant = 0.0821 L-atm/mol-K

T = temperature

Note: The temperature must be expressed in kelvin (K).

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Solution:

Listing the given values

P = 1.21 atm

n = 4.22 mol

T = 34°C + 273 = 307 K

Starting with the ideal gas equation

Dividing both sides of the equation by P to solve for V

Solving for V

Therefore, the volume of a sample of argon is 87.9 L