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Derivation of Kp and Kc

At the triple...

Question

At the triple point of water the number of phases in equilibrium are:

A

zero

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B

one

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C

two

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D

three

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Solution

The correct option is D three
In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. So, at triple point of water the number of phases exists are three.

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Q. For many substances, there exists a temperature

T_{t r}

. and a pressure ptr at which all the three phases of a substance (gaseous, liquid, and solid) are in equilibrium. These temperature and pressure are known as the triple point. For example,

T_{t r} = {0.0075}^{\circ} C

p_{t r} = 4.58 m m

Hg for water. The latent heat of vaporization of water at the triple point is

q = 2.48 \times 10^{3} k J / k g

, and the latent heat of fusion of ice is

λ = 0.34 \times 10^{3} k J / k g

.
Find the latent heat

v

of sublimation (i.e. a direct transition from the solid to the gaseous state) of water at the triple point.

Q. In the phase diagram shown, the point Q corresponds to the triple point of water. The regions I, II and III respectively correspond to phases:

Q. Given below the phase diagram of carbon, answer the following questions:

(a) How many triple points are there and what are the phases that can co-exist at each triple point?

(b) Which has a higher density, diamond?

Q. The pressure on a sample of water at its triple point is reduced while the temperature is held constant. Which phases changes are favoured?

(I) melting of ice
(II) sublimation of ice
(III) vaporization of liquid water.

The temperature at triple point of water is:

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Derivation of Kp and Kc

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