11.22 Answer the following questions based on the P – T phase diagram of CO2:

(a) CO2 at 1 atm pressure and temperature – 60 °C is compressed isothermally. Does it go through a liquid phase ?

(b) What happens when CO2 at 4 atm pressure is cooled from room temperature at constant pressure ?

(c) Describe qualitatively the changes in a given mass of solid CO2 at 10 atm pressure and temperature –65 °C as it is heated up to room temperature at constant pressure.

(d) CO2 is heated to a temperature 70 °C and compressed isothermally. What changes in its properties do you expect to observe?

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    Answered by

    Payal Gupta | Contributor-Level 10

    4 months ago

    11.22

    The fusion and boiling points are given by the intersection point where this parallel line cuts the fusion and vaporization curves. It departs from ideal gas behavior as pressure increases.

    (a) At 1 atm pressure and at – 60 °C, it lies left of -56.6 ? (triple point O). Hence, it lies in the region of vapour and solid phases. Thus,  CO2  condenses into solid state directly, without going through liquid phases.

    (b) At 4 atm pressure,  CO2 lies below 5.11 atm (triple point O). Hence it lies in the region of vaporous and solid phases. Thus, CO2 condenses into solid state directly, without going through liquid

    ...more

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alok kumar singh

According to question, we can write

d = d 0 ( 1 + α Δ T ) 6 . 2 4 1 = 6 . 2 3 0 ( 1 + 1 . 4 × 1 0 5 × Δ T )

T = 1 2 6 . 1 8 + 2 7 = 1 5 3 . 1 8 ° C

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Heat Released by block = Heat gain by large Ice block

m c Δ T = M i c e L

5 × 0.39 × 500 = mice × 335

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= 2.91 kg

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Given

6a2 = 24

a2 = 4

a = 2m

Δ v = v ( γ ) Δ T

= 3 α v Δ T

= 3 × 5 × 1 0 4 × ( a 3 ) × 1 0

= 3 × 5 × 1 0 4 × 8 × 1 0

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Payal Gupta

This is a multiple choice answer as classified in NCERT Exemplar

(b), (c), (d) When the hot milk in the table is transferred to the surroundings by conduction, convection and radiation.

According to newton's law of cooling temperature of the milk falls of exponentially. Heat also will be transferred from surroundings to the milk but will be lesser than that of transferred from milk to surroundings. So option b, c, d satisfy.

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Payal Gupta

This is a multiple choice answer as classified in NCERT Exemplar

(a), (d) During the process AB temperature of the system is 00C . hence it represents phase change that is transformation of ice into water while temperature remains 00C.

BC represents rise in temperature of water from 00C to 1000C. now water starts converting into steam which is represented by CD.

Which is only represents by a, d options

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