Answer : The moles of methane gas could be,
Solution :
According to the Graham's law, the rate of effusion of gas is inversely proportional to the square root of the molar mass of gas.
or,
where,
= rate of effusion of fluorine gas
= rate of effusion of methane gas
= moles of fluorine gas =
= moles of methane gas = ?
= time = 12.3 min (as per question)
= molar mass of fluorine gas = 38 g/mole
= molar mass of methane gas = 16 g/mole
Now put all the given values in the above formula 1, we get:
Therefore, the moles of methane gas could be,