it takes more time to evaporate the same mass of water than to melt the ice by applying same amount of heat per second why?
Answers
It takes longer to boil water than to melt ice because of the difference in the amount of heat required to overcome the forces of attraction by keeping the temperature constant during this time. When ice is melting it is called latent heat of fusion which needs around 334 joules per gram and whereas when the water is boiling it is called latent heat of vaporization which needs around 2230 joules of energy.
Taking this information in hand we can see that that boiling needs approximately 6 to 7 times more amount of energy than in melting. This is the reason it takes longer in boiling than in melting.
It takes more time to operate the same mass of water than two men and ice by applying same amount of heat per second because -
• The evaporation process of water is a change of liquid to gaseous state which needs a particular amount of heat which is known as the enthalpy of vaporization.
And the enthalpy of vaporization of water is 40.6 KJ/Mol.
• On the other hand, the building process of ice is a change of solid to liquid state which needs a particular about known as the enthalpy of fusion.
The enthalpy of fusion of is 6.01 KJ/Mol.
• So,the enthalpy of vaporization needs for amount of heat energy to break the strong molecular bonds of the water.
That's why vaporization of water takes more time than melting of ice.