Compute the number of moles of helium (He) gas contained in a 22.4-L-size container at 1.00 atm pressure and a temperature of 273 K. Use 0.0821 L atm/mol K for the gas constant.

The number of helium moles = 1.0 moles

Explanation:

Step 1: Data given

Volume = 22.4 L

Pressure = 1.00 atm

Temperature = 273 K

R = 0.0821 L*atm/mol*K

Step 2 : Calculate number of moles

pV = nRT

⇒p = The pressure = 1.00 atm

⇒ V = the volume = 22.4 L

⇒ n = the number of moles Helium = TO BE DETERMINED

⇒ R = the gas constant = 0.0821 L*atm / mol*K

n = (p*V)/(R*T)

n = (1.00 *22.4)/(0.0821 * 273)

n = 0.999406 ≈ 1.0 moles ( STP)

The number of helium moles = 1.0 moles

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