Advertisements
Advertisements
प्रश्न
The difference between the two molar specific heats of gas is 9000 J/kg K. If the ratio of the two specific heats is 1.5, calculate the two molar specific heats.
Advertisements
उत्तर
Given,
Cp - Cv = 9000 J/kg K
`"C"_"p"/"C"_"v" = 1.5`
Cv = ?
Cp = ?
`"C"_"p"/"C"_"v" = 1.5`
`"C"_"p" = 1.5 " C"_"v"`
`"C"_"p" - "C"_"v" = 9000`
`1.5 " C"_"v" - "C"_"v" = 9000`
`0.5 " C"_"v" = 9000`
`therefore "C"_"v" = 9000/0.5`
= 18000 J/kg k
`therefore "C"_"p" = 9000 + "C"_"v"`
= 9000 + 18000
= 27000 J/kg k
∴ Two molar specific heats ore 18000 J/kg k and 27000 J/kg k.
APPEARS IN
संबंधित प्रश्न
What do you understand by the following statements:
The specific heat capacity of lead is 130 Jkg-1K-1.
Specific heat capacity of substance A is 3.8 J g-1K-1 whereas the specific heat capacity of substance B is 0.4 J g-1 K-1
(i) Which of the two is a good conductor of heat?
(ii) How is one led to the above conclusion?
(iii) If substances A and B are liquids then which one would be more useful in car radiators?
A liquid X has the maximum specific heat capacity and is used as a coolant in Car Radiators. Name the liquid X.
Differentiate between heat capacity and specific heat capacity.
Water is used in hot water bottles for fomentation. Give a reason.
Water property of water makes it an effective coolant?
Describe a method to determine the specific heat capacity of a solid, like a piece of copper ?
Explain the term boiling ?
Explain the term boiling point ?
Explain the meaning of green house effect.
Give three reasons for the increase of green house gases.
The substances like water which have ........... Heat capacity warm up more slowly than substances like iron which have .......... heat capacity.
What change in heat energy occurs when lead at its melting point
solidifies without change in the temperature?
Define heat capacity.
Does the specific heat capacity of a substance depend upon its mass and rise in temperature only?
Describe a method to determine the specific heat capacity of a solid (say, a piece of copper).
A. hot solid of mass 60 g at 100°C is placed in 150 g of water at 20° C. The final steady temperature recorded is 25°C. Calculate the specific heat capacity of the solid. [Specific heat capacity of water = 4200 J kg-1 °C-1]
A vessel of negligible heat*capacity contains 40g of ice in it at 0°C, 8g of steam at 100°C is passed into the ice to melt it. Find the final temperature of the contents of the vessel.
(Specific latent heat of vaporization of steam = 2268 J/g, specific latent heat of fusion of ice = 336 J/f and specific heat capacity of water = 4.2 J/g°C)
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.
How much heat energy is necessary to raise the temperature of 5 kg of water from 20°C to 100°C?
Write a short note.
Specific heat capacity
Numerical Problem.
What is the heat in joules required to raise the temperature of 25 grams of water from 0°C to 100°C? What is the heat in Calories? (Specific heat of water = `(4.18"J")/("g"°"C")`
Which of the following substances (A, B and C) has the highest specific beat?
Heat is applied to a rigid diatomic gas at constant pressure. The ratio ΔQ : ΔU : ΔW is ______.
For a gas `"R"/"C"_"v" = 0.4,` where 'R' is the universal gas constant and 'Cv' is molar specific heat at constant volume. The gas is made up of molecules which are ______.
An office room contains about 4000 moles of air. The change in the internal energy of this much air when it is cooled from 34° C to 19° C at a constant pressure of 1.0 atm is (Use `gamma_"air"` = 1.4 and Universal gas constant = 8.314 J / mol K) ____________.
The ratio of the specific heats `c_"p"/c_"v"=gamma` in terms of degrees of freedom 'n' is given by ______.
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.
