Question

a compound effuses through a porous cylinder 5.71 times slower than helium. what is its molar mass? identify the compound.

Answer 1

The molar mass of A is 130.42 g

Step-by-step explanation:

Given:

Let the rate of effusion of A = x

So,

rate of effusion of He = 5.71x

Molar mass of He = 4 g/mol

Molar mass of A = ?

We know:

`(rate of effusion of A)/(rate of effusion of He) =(√(m_H_e) )/(√(m_A) )`

On substituting the value:

`(x)/(5.71x) = (√(4) )/(√(m_A) ) \\\\√(m_A) = 5.71 X 2\\\\√(m_A) = 11.42\\ \\m_A = (11.42)^2\\\\m_A = 130.42`

The molar mass of A is 130.42 g