Question

A) What is the density of neon gas at 64.5 ∘C and 3.70 atm?

B) At a different temperature and pressure neon gas was determined to have a density of 1.65 g/L. What is the density of sulfur hexafluoride gas at this new temperature and pressure?

Answer 1

A)

P = 3.7atm

T= 64.5 oC

= (64.5+273) K

= 337.5 K

Molar mass of Ne = 20.18 g/mol

Lets derive the equation to be used

use:

p*V=n*R*T

p*V=(mass/molar mass)*R*T

p*molar mass=(mass/V)*R*T

p*molar mass=density*R*T

Put Values:

3.7 atm *20.18 g/mol = density * 0.08206 atm.L/mol.K *337.5 K

density = 2.696 g/L

Answer: 2.70 g/L

B)

Molar mass of Ne = 20.18 g/mol

Molar mass of SF6 = 146.1 g/mol

p*molar mass=density*R*T

SO,

density2/density1 = molar mass2/molar mass1

density2 / 1.65 = 146.1 g/mol / 20.18

density2 = 146.1*1.65/20.18

= 11.9 g/L

Answer: 11.9 g/L