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Calorimetry

Liquid ammoni...

Question

Liquid ammonia is used in ice factory for making ice from water. If water at $20^{o} C$ is to be converted to $2 k g$ ice at $0^{o} C$ , how many grams of ammonia are to be evaporated? (Given:The latent heat of vapourization of ammonia = $341 c a l / g$ ).

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Solution

Heat released in converting $2 k g$ water at $20^{o} C$ to $2 k g$ ice at $0^{o} C$
$= (2000 \times 20 \times 1) + (2000 \times 80)$
Mass of ammonia evaporated = $m$ gram
Heat used by ammonia = $m \times 341$
Heat loss = Heat gain
$∴ 200000 = m \times 341$
$m = 586 g r a m$

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Q. Solve the following problems:
a. Equal heat is given to two objects A and B of mass 1 g. Temperature of A increases by 3°C and B by 5°C. Which object has more specific heat? And by what factor?
b. Liquid ammonia is used in ice factory for making ice from water. If water at 20°C is to be converted into 2 kg ice at 0°C, how many grams of ammonia are to be evaporated? (Given: The latent heat of vaporization of ammonia= 341 cal/g)
c. A thermally insulated pot has 150 g ice at temperature 0°C. How much steam of 100°C has to be mixed to it, so that water of temperature 50°C will be obtained? (Given : latent heat of melting of ice = 80 cal/g, latent heat of vaporization of water = 540 cal/g, specific heat of water = 1 cal/g °C)
d. 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?

1

0^{o} C

4.6 m m

H g

pressure is converted to water vapour at a constant temperature and pressure. Find

Δ H

Δ E

if the latent heat of fusion of ice is

80

Cal/gm and latent heat of vaporisation of liquid water at

0^{o} C

596

Cal per gram and the volume of ice in comparison to that of water vapour is neglected.

Q. Calculate the amount of heat required to convert

100

0^{o} C

into the water at

0^{o} C

: Given:Specific latent heat of fusion of ice =

336 J / g

.

Q. How much heat energy is released when

5 g

20^{o} C

changes to ice at

0^{o} C

?
[Specific heat capacity of water

= 4.2 J g^{- 1} C^{- 1}

.
Specific latent heat of fusion of ice

= 336 J g^{- 1}

1

0^{\circ} C

4.6

mm Hg pressure is converted to water vapour at a constant temperature and pressure. Find

Δ H

if the latent heat of fusion of ice is

80

Cal/gm and latent heat of vaporization of liquid water at

0^{\circ} C

596

Cal per gram and the volume of ice in comparison to that of water (vapour) is neglected.

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