How many moles of neon (ne) gas have a volume of 4.5l and a pressure of 2.1 atm at 302 k
(the universal gas constant is 0.0821 l•atm/mol•k)

0.3811 mol.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

∵ P = 2.1 atm, V = 4.5 L, T = 302 K, R = 0.0821 L.atm/mol.K.

∴ n = PV/RT = (2.1 atm)(4.5 L)/(0.0821 L.atm/mol.K)(302.0 K) = 0.3811 mol.