Density = 12.40 g/L (or) 0.01240 g/mL
Data Given;
Pressure = P = 763 torr = 1.00395 atm
Temperature = T = 73 °C + 273.15 = 346.15 K
M.mass of UF₆ = M = 352.02 g/mol
Gas Constant = R = 0.0821 atm.L.mol⁻¹.K⁻¹
Formula Used,
Density = P M / R T
Putting values,
Density = (1.00395 atm × 352.02 g.mol⁻¹) ÷ (0.0821 atm.L.mol⁻¹.K⁻¹ × 346.15 K)
Density = 12.40 g/L (or) 0.01240 g/mL