How much water at 100 ° C should be added to water at 20 ° C to provide a bath of 24 kg at 40 ° C ? How much more water at 20 ° C is required to reduce the temperature to 35 ° C ?

Heat loss by water at 100 ° C =Heat gained by water at 20 ° C Let the mass of water1 at 100 ° C =m then mass of water2 at 20 ° C = 24 - m m × c × ∆ t = ( 24 - m ) × c × ∆ t m × c ×60=(24- m )× c ×20 3 m =24- m m =6 k g Heat loss by water at 40 ° C =Heat gained by water at 20 ° C 24 × 5 × c = m ×15× c m = 8 k g

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Mention the differences between a saturated and an unsaturated vapour.

Important Questions on Calorimetry and Change of State

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11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 17 - Calorimetry and Change of State>EXERCISE>Q 12

Define dew point and relative humidity.

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11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 17 - Calorimetry and Change of State>EXERCISE>Q 1

A vessel contains

40 g

of water at

12 ° C

. Into this water are added

50 g

of water at

80 ° C

. The final temperature of the mixture is

46 ° C

. Calculate the thermal capacity of the vessel.

HARD

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 17 - Calorimetry and Change of State>EXERCISE>Q 2

Equal volumes of a solid and a liquid have the same thermal capacity. Calculate the specific heat of the solid of density

3.2 g {cm}^{- 3}

, if the specific heat of the liquid is

0.6

and density is

1.6 g {cm}^{- 3}

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11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 17 - Calorimetry and Change of State>EXERCISE>Q 3

A body of mass

100 g

is heated to

122 ° C

and is quickly immersed in

300 g

of water at

28 ° C

contained in a copper calorimeter of mass

50 g

. The final common temperature is

30 ° C

. If the sp. heat of copper be

0.09

, calculate that of material of the body.

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11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 17 - Calorimetry and Change of State>EXERCISE>Q 4

How much water at

100 ° C

should be added to water at

20 ° C

to provide a bath of

24 kg

40 ° C

? How much more water at

20 ° C

is required to reduce the temperature to

35 ° C

HARD

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 17 - Calorimetry and Change of State>EXERCISE>Q 5

A copper vessel of water-equivalent

60 g

contains

600 g

of water at

30 ° C

. A Bunsen burner, adjusted to supply

100 cal

per second is used to heat the vessel. Calculate the time taken to raise the water to the boiling point.

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11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 17 - Calorimetry and Change of State>EXERCISE>Q 6

A liquid of sp. heat capacity

2268 J {kg}^{- 1} K^{- 1}

and temperature

29 ° C

was mixed with another liquid of sp. heat capacity

1512 J {kg}^{- 1} K^{- 1}

and temperature

11 ° C

. The final temperature of the mixture was

17 ° C

. In what proportion were the liquids mixed?

HARD

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 17 - Calorimetry and Change of State>EXERCISE>Q 7

Two liquids

A

and

B

are at temperature of

75 ° C

and

15 ° C

. Their masses are in the ratio of

2 : 3

and their specific heats are in the ratio of

3 : 4

. Calculate the resultant temperature of the mixture when the two liquids

A

and

B

are mixed.

Mention the differences between a saturated and an unsaturated vapour.

Important Questions on Calorimetry and Change of State

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