At constant temperature, He effuses 6.04 times faster than a gas having an unknown molar mass. Determine the molar mass of the unknown gas.

Explanation:

Rate of effusion =

k is a constant and M is molecular mass .

Molecular mass of He = 4 .

rate of effusion of He = r₁

Molecular mass of unknown compound = M

rate of effusion of unknown gas  = r₂

r₁ = k / √4

r₂ = k / √M

r₁ / r₂ = √ ( M/4 )

6.04 = √ ( M/4 )

36.48 = M/4

M = 146 approx .

molecular mass of unknown gas = 146 .

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".