Advertisements
Advertisements
प्रश्न
Steam at 100°C is passed over 1000 g of ice at 0°C. After some time, 600 g of ice at 0°C is left and 450 g of water at 0°C is formed. Calculate the specific latent heat of vaporization of steam (Given: specific heat capacity of water = 4200 J/kg°C, specific latent heat of fusion of ice = 336,000 J/kg.)
उत्तर
Let 'L' J/kg be the specific latent heat of vaporisation of steam.
Mass of ice method = (1000 - 600)g = 400g = 0.4 kg
∴ Mass of steam condensed into water = (450 - 400) = 50g = 0.05 kg
(i) Heat given out by steam in condensing into water at the same temperature i.e., 100°C
= mL = 0.05 × L = 0.050 L J
(ii) Heat given out by 0.050 kg of water at 100°C in cooling down to 0°C
= mst = (0.50 × 4200 × 100) J = 21000 J
(iii) Heat taken up by ice in melting into water at the same temperature
= ml = 0.4 × 336000 J
Heat given out = Heat taken up
0.050 L + 21000 = 0.4 × 33600
L = `(0.4 xx 336000 - 21000)/0.050` = 2268000 J/kg
Latent heat of vaporisation of steam = 2268000 J/kg.
APPEARS IN
संबंधित प्रश्न
What do you understand by the term latent heat?
Write the approximate value of specific latent heat of ice.
1 g ice of 0℃ melts to form 1 g water at 0℃. State whether the latent heat is absorbed or given out by ice.
- Which requires more heat: 1 g ice at 0℃ or 1 g water at 0℃ to raise its temperature to 10℃?
- Explain your answer in part (a).
Calculate the total amount of heat energy required to convert 100 g of ice at −10℃ completely into water at 100℃. Specific heat capacity of ice = 2.1 J g-1 K-1, specific heat capacity of water = 4.2 J g-1K-1, specific latent heat of ice = 336 J g-1.
During transformation of liquid phase to solid phase, the latent heat is ______.
Liquid ammonia is used in ice factory for making ice from water. If water at 20°C is to be converted into 2 kg ice at 0°C, how many grams of ammonia are to be evaporated? (Given: The latent heat of vaporization of ammonia = 341 cal/g)
Explain the following temperature vs time graph.
Name two factors on which the heat absorbed or given out by a body depends.
When 1 g of ice at 0 °C melts to form 1 g of water at 0 °C then, is the latent heat absorbed by the ice or given out by it?
The specific latent heat of vaporisation of steam is 2260 J/g. Comment on this.
Specific latent heat of vaporisation : J/kg : : specific heat : _______
Define boiling point of a liquid.
Match the columns.
| Column A | Column B |
| 1) Specific latent heat of fusion | a) Air saturated with vapour |
| 2) Specific latent heat of vaporisation | b) Solid converts into liquid |
| 3) Dew point temperature | c) liquid converts into gas |
Write the name.
Products obtained when sugar is heated.
Write scientific reason.
Even if boiling water is constantly heated, its temperature does not rise.
For the same mass of ice and ice-cold water, why does ice produce more cooling than ice-cold water?
Calculate the total amount of heat energy required to melt 200 g of ice at 0°C to water at 100°C. (Specific latent heat of ice = 336 Jg-1, specific heat capacity of water = 4.2 Jg-1 °C-1)
