Consider the equation Z- PV nRT - which of the following statement is correct-

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Standard XII

Chemistry

Compressibility Factor

Consider the ...

Question

Consider the equation $Z = \frac{P V}{n R T}$ ; which of the following statement is correct?

When

Z > 1

, real gases are easier to compress than the ideal gas.

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When

Z = 1

, real gases get compressed easily.

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When

Z > 1

, real gases are difficult to compress.

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When

Z = 1

, real gases are difficult to compress.

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Solution

The correct option is D When $Z > 1$ , real gases are difficult to compress.
The deviation from ideal behaviour is expressed by the factor $Z$ known as compressibility factor in the ideal gas equation. $Z$ is expressed as $Z = P V / n R T$
In case of real, $P V = n R T$ , therefore $Z \neq 1$
When $Z > 1$ , it is a positive deviation. It shows that the gas is less compressible expected from ideal behaviour.

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Similar questions

The gases which strictly follow the general equation

(P V = n R T)

are called ideal or perfect gases. Actually, there is no gas which is perfect or ideal. A real gas is one which actually exists, whether it obeys gas laws strictly or not. Under ordinary conditions, only those gases nearly behave as ideal or perfect which have very low boiling points such as nitrogen, hydrogen, etc. The most easily liquefiable and highly soluble gases such as ammonia, carbon dioxide, sulphur dioxide show large deviations.
A very convenient method of studying deviation of real gases from ideal behaviour is through a compressibility factor

(Z)

Z = \frac{P V}{n R T}

(i)

Z = 1

, for ideal gases.
(ii)

Z \neq 1

, for real gases.

Consider the equation

Z = \frac{P V}{n R T}

; which of the following statements is correct?

Q. Assertion :Compressibility factor Z according to van der Waal's equation may be written as

Z = \frac{1}{1 - (\frac{n b}{V})} - \frac{a n}{R T V}

. Reason: For real gases

Z >< 1

Q. The given graph represent the variations of

Z

(compressibility factor

(Z) = \frac{p V}{n R T})

versus

P

, for three real gases

A, B

and

C

. Identify the only incorrect statement.

Q. the given graph represents the variation of

Z

(compressibility factor

= \frac{P V}{n R T})

versus

P

, for three real gases

A, B

and

C

. Identify the only correct statement.

The given graph represents the variation of

Z

(compressibility factor

= \frac{P V}{n R T}

) versus

P

, for three real gases

A, B

and

C

Identify the only incorrect statement :

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Consider the equation Z=PVnRT ; which of the following statement is correct?

Consider the equation $Z = \frac{P V}{n R T}$ ; which of the following statement is correct?