Advertisements
Advertisements
प्रश्न
A calorimeter has mass 100 g and specific heat 0.1 kcal/ kg°C. It contains 250 gm of liquid at 30°C having specific heat of 0.4 kcal/kg°C. If we drop a piece of ice of mass 10 g at 0°C, What will be the temperature of the mixture?
Advertisements
उत्तर
Let the final temperature of the mixture be T.
Amount of heat required in converting 10 g ice to 0°C to water at 0°C = 10 × 80 = 800 cal
Total amount of heat required in converting 10 g water to 0°C to water at T°C = 10 × 1 × T = 10T
Total heat energy required to convert 10 g ice at 0°C to water at T°C = 800 + 10T
Amount of heat released to raise the temperature of calorimeter at 30°C to T°C = 100 × 0.1 × (30 − T) = 10(30 − T)
Amount of heat released to raise the temperature of 250g of water at 30°C to T°C = 250 × 0.4 × (30 − T) = 100(30 − T)
Total amount of heat released in the process = 110(30 − T)
Using the principle of the calorimeter, we have
110(30 − T) = 800 + 10T
APPEARS IN
संबंधित प्रश्न
The temperature of 170 g of water at 50°C is lowered to 5°C by adding a certain amount of ice to it. Find the mass of ice added.
Given: Specific heat capacity of water = 4200 J kg-1 °C-1 and specific latent heat of ice = 336000 J kg-1.
Write the approximate value of specific heat capacity of water in S.I. unit.
A heater of power P watt raises the temperature of m kg of a liquid by Δt K in time t s. Express
the specific heat capacity of liquid in terms of above data.
Explain the term boiling point ?
Name three fossil fuels that emit carbon dioxide into the atmosphere ?
State the effect of enhancement of green house effect.
A solid of mass 80 g at 80°C is dropped in 400 g water at 10°C. If final temp. is 30°C, find the sp. heat cap. of the solid.
What are other units of heat? Name and define them.
Explain, why water is considered as best liquid for quenching thirst?
Describe a method to determine the specific heat capacity of a solid (say, a piece of copper).
A substance is in the form of a solid at 0°C. The amount of heat added to this substance and the temperature of the substance are plotted on the following graph:
If the specific heat capacity of the solid substance is 500 J/kg °G, find from the graph, the mass of the substance.
A piece of ice is heated at a constant rate. The variation of temperature with heat input is shown in the graph below:
(i) What are represented by AB and CD?
(ii) What conclusion can you draw regarding the 110°c nature of ice from the above graph?
The cold object the hot object enclosed in one box of heat-resistant material.
- What changes will occur in the two objects when temperature flows from those objects?
- Which principle can show that the energy exchange takes place between two objects only when kept in isolated system?
When a uniform rod is heated, which of the following quantity of the rod will increase
Express the change in internal energy in terms of molar specific heat capacity.
At same temperature and pressure of an ideal gas, ____________.
The ratio of the specific heats `c_"p"/c_"v"=gamma` in terms of degrees of freedom 'n' is given by ______.
The diagram below shows a cooling curve for 200 g of water. The heat is extracted at the rate of 100 Js-1. Answer the questions that follow:
- Calculate specific heat capacity of water.
- Heat released in the region BC.
What is the amount of heat required to raise the temperature of 5 kg of iron from 30°C to 130°C? Specific heat capacity of iron = 483 Jkg-1C-1.
