Question

To make a neon sign, a sample of neon gas is introduced into a previously evacuated glass tube with a volume of 0.35 L . The pressure of the gas is 15 Torr at a temperature of 35 degree .
Calculate the number of moles of neon in the tube.

Answer 1

Answer:

Only density will change. Pressure and temperature will remain same. Density will depend on molar mass as number of moles and volume are constant. Pressure and temperature will depend only on volume and number of moles which are same for both gases

Answer 2

Answer:

2.7*10^-4 mol Ne

Explanation:

PV/RT=n

V = 0.35 L

P = 15 Torr

T = 35°C +273.15 = 308.15 K

R = 62.36 L Torr K^-1 mol^-1

PV/RT=n =(15 Torr)(0.35 L)/(62.36 L Torr K^-1 mol^-1)(308 K) = 2.7*10^-1

=2.7*10^-1