You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard VIII

Physics

Condensation

Some water at...

Question

Some water at 0 degree Celsius is placed in a large insulated closure .The water vapour formed is pumped out continuously.What fraction of water will ultimately freeze,if the latent heat of vaporisation is seven times the latent heat of fusion?

Open in App

Solution

$T h e a m o u n t o f w a t e r v a p o r i s e d = 7 m a n d t h e a m o u n t o f w a t e r f r e e z e d = m t o t a l a m o u n t o f w a t e r = m + 7 m = 8 m T h e r e f o r e t h e a m o u n t o f w a t e r f r e e z e d = \frac{7}{8} \times 100 \frac{700}{8} = 87.5 %$

Suggest Corrections

Similar questions

Q. A thermally insulated vessel contains some water at

0^{\circ} C

. The vessel is connected to a vacuum pump to pump out water vapour. This results in some water getting frozen. It is given Latent heat of vaporization of water at

0^{\circ} C = 21 \times 10^{5} J / k g

and latent heat of freezing water

= 3.36 \times 10^{5} J / k g

. The maximum percentage amount of water that will be solidified in this manner will be

Q. There is a substance whose vapourisation and freezing temperature (transition temperature) is same. It is placed at transition temperature with its main constituent being liquid state and a little vapour in a closed container. Now, vapour is pumped out continuosly. The fraction of this substance that will ultimately freeze is

\frac{7}{8}

. If the latent heat of vaporization is

^{'} x^{'}

times the latent heat of fusion. Find out value of

^{'} x^{'}

(Answer upto two digit after decimal point).

Q. A thermally isolated vessel contains

100 g

of water at

0^{o} C

When air above the wall pumped out, some of the water freezes and some evaporates at

0^{o} C

itself. Calculate the number of the ice formed if no water is left in the vessel. Latent heat of vaporization of water

0^{o} C = \times 10^{6} J k g^{- 1}

and latent heat of fusion of ice

= 3.36 \times 10^{5} J k g^{- 1}

Q. A thermally insulated vessel contains

150 g

of water at

0^{\circ} C

. Then the air from the vessel is pumped out adiabatically. A fraction of water turns into ice and the rest evaporates at

0^{\circ} C

itself. The mass of evaporated water will be closest to
(Latent heat of vaporization of water

= 2.10 \times 10^{6} J k g^{- 1}

and Latent heat of fusion of water

= 3.36 \times 10^{5} J k g^{- 1})

A thermally isolated vessel contains $100 g$ of water at $0^{\circ} C$ . When air above the water is pumped out, some of the water freezes and some evaporates at $0^{\circ} C$ itself. Calculate the mass of the ice formed if no water is left in the vessel. Latent heat of vaporization of water at $0^{\circ} C$ = $2.10 \times 10^{5} J k g^{- 1}$ and latent heat of fusion of ice = $3.36 \times 10^{5} J k g^{- 1}$

Join BYJU'S Learning Program

Some water at 0 degree Celsius is placed in a large insulated closure .The water vapour formed is pumped out continuously.What fraction of water will ultimately freeze,if the latent heat of vaporisation is seven times the latent heat of fusion?

The amount of water vaporised=7mand the amount of water freezed=mtotal amount of water =m+7m=8mTherefore the amount of water freezed=78×100 7008=87.5%

$T h e a m o u n t o f w a t e r v a p o r i s e d = 7 m a n d t h e a m o u n t o f w a t e r f r e e z e d = m t o t a l a m o u n t o f w a t e r = m + 7 m = 8 m T h e r e f o r e t h e a m o u n t o f w a t e r f r e e z e d = \frac{7}{8} \times 100 \frac{700}{8} = 87.5 %$