Ideal gas law: A 3.2-L volume of neon gas (Ne) is at a pressure of 3.3 atm and a temperature of 330 K. The atomic mass of neon is 20.2 g/mol, Avogadro's number is 6.022 × 10²³ molecules/mol, and the ideal gas constant is R = 8.314 J/mol · K = 0.0821 L · atm/mol · K. The mass of the neon gas is closest to

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Using the ideal gas law PV = nRT, we find n = PV/RT = (3.3 atm)(3.2 L) / (0.0821 L·atm/mol·K)(330 K) = 0.39 mol. The mass is n × molar mass = 0.39 mol × 20.2 g/mol = 7.878 g = 7.9 × 10^-3 kg.

Ideal Gas Law: a 3