What is the mass of neon that exerts a pressure of 720. mmHg, with a temperature of - 15.0 °C, when the volume of the container is 760. mL?

Mass = 0.61 g

Explanation:

Given dа ta:

Pressure of neon gas = 720 mmHg

Temperature = - 15.0°C

Volume = 760 mL

Mass of neon gas = ?

Solution:

720 mmHg = 720/760 = 0.95 atm

-15.0°C + 273 = 258 K

760/1000 = 0.76 L

PV = nRT

n = PV/RT

n = 0.95 atm * 0.76 L / 0.0821 atm. L. k⁻¹. mol⁻¹ * 258 K

n = 0.722 atm. L / 21.2 atm. L. mol⁻¹

n = 0.03 mol

Mass of neon:

Mass = number of moles * molar mass

Mass = 0.03 mol * 20.2 g/mol

Mass = 0.61 g