A 1 L flask cantaing vapours of methyl alcohol (molar mass 32) at a pressure was `10^(-3)` mm. How many molecules of mehtyl alcohol are left in the flask ?

A 1 L flask containing vapours of methyl alcohol (molar mass 32) at a pressure of 1atm and 25^@C was evacuated till the fill was 10^(-3) mm. How many molecules of methyl alcohol are left in the flask ?

1L of a gas is at a pressure of 10^(-6) mm of Hg at 25^(@)C . How many molecules are present in the vessel.

A flask of volume 1 litre contains vapour of CH_3OH at a pressure of 1 atm and 25^oC . The flask was then evacuated till the final pressure dropped to 10^(−4) mm. Find the number of molecules of methyl alcohol left in the flask.

A flask containing 12 g of a gas relative molecular mass 120 at a pressure of 100 atm was evacuated by means of a pump until the pressure was 0.01 atm . Which of the following in the best estimate of the number of molecules left in the flask (N_(0)=6xx10^(23)mol^(-1)) ?