Advertisements
Advertisements
प्रश्न
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")`
Advertisements
उत्तर
Given m = 25 g, ∆T = (100 – 0) = 100°C
Or in terms of Kelvin (373.15 – 273.15) = 100K,
C = `(4.18"J")/("g"°"C")`
Heat energy required, Q = m × C × ∆T = 25 × 4.18 × 100 = 10450 J
APPEARS IN
संबंधित प्रश्न
What do you mean by the following statement?
The heat capacity of a body is 50 JK-1?
Ice cream appears colder to the mouth than water at 0℃. Give reason.
Figure shows a paddle wheel coupled to a mass of 12 kg through fixed frictionless pulleys. The paddle is immersed in a liquid of heat capacity 4200 J K−1 kept in an adiabatic container. Consider a time interval in which the 12 kg block falls slowly through 70 cm. (a) How much heat is given to the liquid? (b) How much work is done on the liquid? (c) Calculate the rise in the temperature of the liquid neglecting the heat capacity of the container and the paddle.
Define the term 'specific heat capacity' and state its unit.
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.
Name the substance which has maximum specific heat capacity.
The specific heat capacity of water is 1 cal/g °C.
Numerical Problem.
What could be the final temperature of a mixture of 100 g of water at 90 °C and 600g of water at 20°C.
Observe the following diagram and answer the questions given below:
Specific heat capacity of metals
- Which element has maximum specific heat capacity? Justify.
- Which element has minimum specific heat capacity? Justify.
- Define specific heat of object.
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 ______.
