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महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

The molar specific heat of a gas at constant volume is 12307.69 J kg-1 K-1. If the ratio of the two specific heats is 1.65, calculate the difference between the two molar specific heats of gas.

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प्रश्न

The molar specific heat of a gas at constant volume is 12307.69 J kg-1 K-1. If the ratio of the two specific heats is 1.65, calculate the difference between the two molar specific heats of gas. 

पर्याय

  • 7999 J kg-1 K-1

  • 7245 J kg-1 K-1

  • 6890 J kg-1 K-1

  • 4067 J kg-1 K-1 

MCQ
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उत्तर

7999 J kg-1 K-1 

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पाठ 3: Kinetic Theory of gases and Radiation - MCQ’s

संबंधित प्रश्‍न

Given below are observations on molar specific heats at room temperature of some common gases.

Gas

Molar specific heat (Cv)

(cal mol–1 K–1)

Hydrogen 4.87
Nitrogen 4.97
Oxygen 5.02
Nitric oxide 4.99
Carbon monoxide 5.01
Chlorine 6.17

The measured molar specific heats of these gases are markedly different from those for monatomic gases. Typically, molar specific heat of a monatomic gas is 2.92 cal/mol K. Explain this difference. What can you infer from the somewhat larger (than the rest) value for chlorine?


A child running a temperature of 101°F is given an antipyrin (i.e. a medicine that lowers fever) which causes an increase in the rate of evaporation of sweat from his body. If the fever is brought down to 98 °F in 20 min, what is the average rate of extra evaporation caused, by the drug? Assume the evaporation mechanism to be the only way by which heat is lost. The mass of the child is 30 kg. The specific heat of human body is approximately the same as that of water, and latent heat of evaporation of water at that temperature is about 580 cal g–1.


What do you understand by the following statements:

The specific heat capacity of lead is 130 Jkg-1K-1.


Water in lakes and ponds do not freeze at once in cold countries. Give a reason is support of your answer.


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.


How will global warming disturb the ecological balance?


Name and state the principle used to measure the specific heat capacity of a substance.


104g of water at 30°C is taken in a calorimeter made of copper of mass 42 g. When a certain mass of ice at 0°C is added to it, the final steady temperature of the mixture after the ice has melted, was found to be 10°C. Find the mass of ice added. [Specific heat capacity of water = 4.2 Jg–1°C–1 ; Specific latent heat of fusion of ice = 336 Jg–1; Specific heat capacity of copper = 0.4 Jg–1°C–1] .


What is the value of specific heat of water?

Write down the relation between specific heat and heat capacity.

Find the amount of heat required to convert 2 g of ice at 0°C into water at 0°C. Latent heat of fusion of ice= 336 Jg-1.

A substance is heated at a constant rate from a low temperature to a high temperature. A graph of temperature against time is shown in the figure. Which part or parts of the graph correspond(s) to the substance existing in two states?


What is heat? What is the S. I. unit of heat?


Explain, Why is it advisabile to pour cold water over burns, caused on human body, by hot solids?


Explain, why does a wise farmer water his fields, if forecast is forst?


Some heat is provided to a body to raise its temperature by 25°C. What will be the corresponding rise in temperature of the body as shown on the Kelvin scale?


The temperature of a lead piece of mass 400 g rises from 20°C to 50°C when 1560 J of heat is supplied to it. Calculate Specific heat capacity of lead.


Calculate the amount of heat released when 5.0 g of water at 20°C is changed into ice at 0°C.
(Specific heat capacity of water = 4.2 J/g°C
Specific latent heat of fusion of ice = 336 J/g)


Answer the following question.

Why do we generally consider two specific heats of a gas?


Solve the following problem.

What is the specific heat of metal if 50 cal of heat is needed to raise 6 kg of the metal from 20°C to 62 °C?


Derive Mayer’s relation.


Write the name.

The amount of heat absorbed at constant temperature by unit mass of a liquid to convert into gaseous phase.


Decide the unit for specific heat capacity.


The cold object the hot object enclosed in one box of heat-resistant material.

  1. What changes will occur in the two objects when temperature flows from those objects?
  2. Which principle can show that the energy exchange takes place between two objects only when kept in isolated system?

Define specific heat capacity.


What is specific heat capacity?


Give one example where high specific heat capacity of water is used as heat reservoir.


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