College Chemistry help please

Question

At STP, how many moles of helium gas would occupy 1.00 L? (R = 0.0821 L.atm/mol.k)

	A) 2.24 moles
	B) 224 moles
	C) 22.4 moles
	D) 0.446 moles
	E) 0.0446 moles

Answer 1

Molar volume of gas at STP is 22.4L/mol

? mol He = 1.00L x (1 mol/22.4L) = 0.0446 mol

OR

you could use PV = nRT

rearrange n = PV/RT where P = 1 atm, T = 273.15K, R is given.