Question

At 380mm pressure and 0°C number of
moles of the gas present in 11.2 lit of it are
1) 0.25 2)0.5 3)0.75 4)1​

Answer 1

Hi,

Answer:

The number of moles of the gas present is 0.25 moles.

Explanation:

Given data:

The volume of the gas, V = 11.2 litre

Temperature, T = 0℃ = 273 K

Pressure, P = 380 mmHg = 380 / 760 atm = 0.5 atm …… [since 760 mmHg = 1 atm]

Ideal gas constant, R = 0.082057 L atm mol⁻¹ K⁻¹

To find: No. of mole of the gas present

Let the no. of moles of the gas be “n”.

Using the Ideal Gas Law,  

PV = nRT

⇒ n = PV / RT

⇒ n = [0.5 * 11.2] / [0.082057 * 273] = 5.6 / 22.4 = 0.25 moles

Hope this helps!!!!!