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:

To calculate the no. of moles of a gas, we can use the general law of ideal gas: PV = nRT.

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.