A certain mass of saturated water vapour is contained in a cylindrical vessel under a weightless piston at one atmosphric pressure. The piston is slowly lowered till 0.7g of vapour gets condensed. The volume under thepiston is now only 1/5 th of the original volume. Find the original mass of the vapour. Neglect volume of the liquid formed. What is the temperature of the vapour?

A certain mass of saturated water vapour is contained in a cylindrical

1.	A certain mass of saturated water vapour is contained in a cylindrical vessel under a weightless piston at one atmosphric pressure. The piston is slowly lowered till 0.7g of vapour gets condensed. The volume under thepiston is now only 1/5 th of the original volume. Find the original mass of the vapour. Neglect volume of the liquid formed. What is the temperature of the vapour?
Answer» ANSWER :`1.14g, 100^(@)C`