Home
Class 12
PHYSICS
A saturated water vapour is contained in...

A saturated water vapour is contained in a cylindrical vessel under a weightless piston at a temperature `t = 100 ^@C`. As a result of a slow introduction of the piston a small fraction of the vapour `Delta m = 0.70 g` gets condensed. What amount of work was perfomed over the gas ? The vapour is assumed to be ideal, the volume of the liquid is to be neglected.

Text Solution

Verified by Experts

The condensation takes place at constant pressure and temperature and the work done is
`p Delta V`
where `Delta V` is the volume of the condensed vapour in the vapour phase. It is
`p Delta V = (Delta m)/(M) RT = 120.6 J`
where `M = 18 gm` is the molecular weight of water.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • THERMODYNAMICS AND MOLECULAR PHYSICS

    IE IRODOV, LA SENA & SS KROTOV|Exercise Transport Phenomena|38 Videos
  • THERMODYNAMICS AND MOLECULAR PHYSICS

    IE IRODOV, LA SENA & SS KROTOV|Exercise Liquids Capillary Effects|25 Videos
  • PHYSICAL FUNDAMENTALS OF MECHANICS

    IE IRODOV, LA SENA & SS KROTOV|Exercise Relativistic Mechanics|49 Videos

Similar Questions

Explore conceptually related problems

A saturated water vaporu (M=18) is contained in a vessel fitted with a piston at a temeprature t=100^(@)C . As a result of slow introduction of the piston a small fractioin of the vapour Deltam=1g gets condensed. What amount of work is done over the gas?

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?

The saturated water vapour is enclosed in a cylinder under a piston and occupies a volume of 5 litres at 100^(@)C . Find the mass oif th water formed after the volume under the piston is decreased to 1.6 litres at the same temperature.

The saturated water vapour is inclosed in a cylinder under a piston and occupies a volume V_0 = 5.0 1 at the temperature t = 100 ^@C . Find the mass of the liquid phase formed after the volume under the piston decreased isothermally to V = 1.6 1 . The saturated vapour is assumed to be ideal.

Saturated water vapour is enclosed in a cylinder undr a piston and occupies volume V_(0)=5 litre at temperature t=100^(@)C . Find the mass of water formed after the volume under the piston is decreased isthermally to V=2 litres. Saturated vapour pressure at 100^(@)C =10^(5)Nm^(-2) .

One mole of water being in equilibrium with a negligible amount of its saturated vapour at a temperature T_1 was completely converted into saturated vapour at a temperature T_2 . Find the entropy increment of the system. The vapour is assumed to be an ideal gas, the specific volume of the liquid is negligible on comparsion with that of the vapour.

One gram of saturated water vapour is enclosed in a thermally insulated cylinder ubder a weightless piston. The outside pressure being standard, m = 1.0 g of water is introduced into the cylinder at a temperature t_0 = 22 ^@C . Neglecting the heat capacity of the cylinder and the friction of the piston against the cylinder's walls, find the work performed by the force of the atmospheric pressure during the lowering of the piston.

One gram of saturated vapour is enclosed in a thermally insulated cylinder under a weightless piston. The outside pressure is standard m=1g of water is introduced into the cylinder at a temperature t_(0)=22^(@)C . Neglecting the heat capacity of the cylinder and piston and friction, find the work done by the force of the atmosphere during the lowering of the piston. T= temperature of saturated vapour =373K, L sp. heat latent heat =12250//kJ//kg

One mole of an ideal gas is contained in a vertical cylinder under a massless piston moving without friction. The piston is slowly raised so that the gas expands isothermally at temperature T_0 = 300 K. Find the amount of work done increasing the volume to eta =2 times. The outside pressure is atmospheric.

A small amount of water and its saturated vapour are enclosed in a vessel at a temperature t = 100^@C . How much (in per cent) will the mass of the saturated vapour increase if the temperature of the system goes up by Delta T = 1.5 K ? Assume that the vapour is an ideal gas and the specific volume of water is negligible as compared to that vapour.