Advertisements
Advertisements
प्रश्न
Solve the following problem.
Specific latent heat of vaporization of water is 2.26 × 106 J/kg. Calculate the energy needed to change 5.0 g of water into steam at 100 ºC.
Advertisements
उत्तर
Given: Lvap = 2.26 × 106 J/kg, m = 5g = 5 × 10-3 kg
In this case, no temperature change takes place an only a change of state occurs.
To find: Heat required to convert water into steam.
Formula: Heat required = mLvap
Calculation: From formula,
Heat required = 5 × 10-3 × 2.26 × 106
= 11300 J
= 1.13 × 104 J
Heat required to convert water into steam is 1.13 × 104 J.
APPEARS IN
संबंधित प्रश्न
State two factors upon which the heat absorbed by a body depends
50 g of metal piece at 27°C requires 2400 J of heat energy so as to attain a temperature of 327°C . Calculate the specific heat capacity of the metal.
Water is used in hot water bottles for fomentation. Give a reason.
Describe a method to determine the specific heat capacity of a solid, like a piece of copper ?
Explain the meaning of green house effect.
Name three fossil fuels that emit carbon dioxide into the atmosphere ?
In Regnault's apparatus for measuring specific heat capacity of a solid, there is an inlet and an outlet in the steam chamber. The inlet is near the top and the outlet is near the bottom. Why is it better than the opposite choice where the inlet is near the bottom and the outlet is near the top?
What is the specific heat capacity of boiling water?
The product of mass and specific heat is known as ..........
If 10125 J of heat energy boils off 4.5 g of water at 100°C to steam at 100°C, find the specific latent heat of steam.
What are the factors on which the quantity of heat given to a body depends?
Name the substance which has maximum specific heat capacity.
Explain, Why is it advisabile to pour cold water over burns, caused on human body, by hot solids?
If substances A and B are liquids then which one would be more useful in car radiators?
Given: Specific heat capacity’A’ 3.8 J/g /K. Specific heat capacity ‘B’ 0.4 J/g /K.
An equal quantity of heat is supplied to two substances A and B. The substance A shows a greater rise in temperature. What can you say about the heat capacity of A as compared to that of B?
Is it possible to condense the water formed, back to ice by adding ice at 0°C. Explain with reason.
Why are athletes advised to put on extra clothes after competing on event?
Derive an expression for finding out the specific heat capacity of a body (solid) from the readings of an experiment given below:
(i) Mass of empty calorimeter (with stirrer) = m1 gm
(ii) Mass of the metal piece = M gm
(iii) Mass of colorimeter and water = m2 gm
(iv) Initial temperature and water = t1°C
(v) Temperature of hot solid (metal piece) = t2 °C
(vi) Final temperature of the mixture = t°C
(vii) Specific heat of calorimeter = 0.4 J gm / °C
The SI unit of specific heat is _______.
Consider the statement given below and choose the correct option.
Assertion: Radiation is a form of heat transfer which takes place only in vacuum.
Reason: The thermal energy is transferred from one part of a substance to another part without the actual movement of the atoms or molecules.
Express the change in internal energy in terms of molar specific heat capacity.
Two metals A and B have specific heat capacities in the ratio 2:3. If they are supplied same amount of heat then
If the mass ratio of metal A and metal B is 3:5 then calculate the ratio in which their temperatures rise.
Two cylinders of equal height and radius are made of copper and aluminum. Which of them conducts heat faster?
We would like to make a vessel whose volume does not change with temperature (take a hint from the problem above). We can use brass and iron `(β_(vbrass) = (6 xx 10^(–5))/K and β_(viron) = (3.55 xx 10^(–5))/K)` to create a volume of 100 cc. How do you think you can achieve this.
The molar specific heats of an ideal gas at constant pressure and volume are denoted by Cp and Cv, respectively. If `gamma = "C"_"p"/"C"_"v"` and R is the universal gas constant, then Cv is equal to ______.
Give one example where high specific heat capacity of water is used as heat reservoir.
