Question

The residual pressure in a vessel, which is evacuated
at 27°C, is 10 Nm. Find the number of molecules
per cm still remaining in the vessel.​

Answer 1

Dear Student,

● Answer -

Molecules per cm^3 = 2.414×10^15

◆ Explaination -

# Given -

P = 10 Nm

T = 27 ℃ = 300 K

# Solution -

Let N be no of molecules in the vessel.

Applying ideal gas equation,

PV = nRT

10 × V = (N/NA) × 8.314 × 300

N/V = 10 × 6.022×10^23 / (8.314 × 300)

N/V = 2.414×10^21 molecules/m^3

N/V = 2.414×10^15 molecules/cm^3

Thanks dear. Hope this helps you...