Answer:
Mass = 0.61 g
Explanation:
Given data:
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
