Under certain conditions argon (ar) gas diffuses at a rate of 3.2 centimeters per second. under the same conditions, an unknown gas diffuses at a rate of 4.5 centimeters per second. what is the approximate molar mass of the unknown gas?

a) 10 g/mol
b) 20 g/mol
c) 28 g/mol
d) 56 g/mol

c) 28 g/mol

Explanation: Rate of diffusion : It is defined as the volume of gas effused in a given time 't'.

Formula used :

According to Graham's law of diffusion, rate of diffusion is inversely proportional to the square root of the mass of the gas.

where,

= rate of diffusion of argon gas = 3.2cm/sec

= rate of diffusion of unknown gas = 4.5 cm/sec

= Molar mass  of argon gas= 40g/mol

=  Molar mass  of unknown gas

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.