Posted by **Emily** on Saturday, April 27, 2013 at 9:39am.

A sample of argon gas at STP occupies 56.2 liters. Find the number of moles of argon and the mass in the sample

- Chemistry -
**DrBob222**, Saturday, April 27, 2013 at 5:03pm
1 mol occupies 22.4 L at STP. Solve for n, then n = grams/molar mass. You know molar mass and n, solve for grams.

OR you may use PV = nRT to solve for n.

- Chemistry -
**tabs**, Tuesday, October 6, 2015 at 6:58pm
PV = nRT

n = PV/RT @ STP T= 0+273k; P = 1atm R = 0.821 L- atm/mol-K

n = 1atm(56.2L)/0.821 L- atm/mol-K(273k)

n = 2.50 mole

2.50 moles of Ar =39.984g of Ar/1mole of Ar

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