Compressibility Factor

Q.

A mole of $CC{l}_4$ vapours at ${77}^{\circ }C$ occupies a volume of 36.0 L.If vanderwaals constants are $a=20.39L^{2}atmmo{l}^{-2}$ and $b=0.1383Lmo{l}^{-1}$ calculate the compressibility factor Z under (a) low pressure region and (b) high pressure region.
The values of compressibility factor Za and Zb respectively are:

1. Za = 0.82, Zb = 1.12

2. Za= 0.98, Zb =1.004

3. Za=0.90, Zb=1.12

4. Za=0.90, Zb=1.22

Q.

The compressibility factor for an ideal gas is:

1. 1.5

2. 1.0

3. 2.0

4. ∞

Q.

The compressibility factor for an ideal gas is

1. 2.0

2. 1.0

3. 1.5

4. ∞

Q. A real gas at its critical points has the value of $\frac{R{T}_c}{8P_c}=0.2L/mol$. (Where R is the gas constant). If this gas follows the equation P(V − nb) = nRT at STP, then find the volume (in litres) of the container in which 3 moles of this gas is occupied at STP. (Assume T= $0^{\circ }C$ and P=1 atm at STP)

Q.

The given graph in Fig represents the variation of Z $(compressibilityfactor=\frac{PV}{nRT}$) vs P , for the three real gases A, B and C. identify the only incorrect statement

1. For gas B, b=0 and its dependence on p are linear at all pressures.

2. For the gas C, which is typical real gas which neither a nor b=0.By knowing the minima and the point of intersection with z=1, a and b can be calculated.

3. At high pressure, the slope is positive for all real gases.

4. For gas A, a=0 and its dependence on p is linear at all pressures.

Q.

What is the compressibility factor for $H_2$ which behaves as a real gas?

1. 1

2. 

3. 

4. 

Q.

The compressibility factor for a real gas at high pressure is ____.

1. 1

2. 

3. 

4. 

Q.

The compressibility factor of a gas is less than 1 at STP. Its molar volume $V_m$ will be:

1. V _m > 22.42L

2. V _m < 22.42 L

3. V _m = 22.42 L

4. V _m > 26.42L

Q.

The density of vapour of a substance (X) at 1 atm pressure and 500 K is 0.8 $\frac{kg}{m^3}$. The vapour effuses through a small hole at a rate of $\frac{4}{5}$ times slower than oxygen under the same condition. What is the compressibility factor (Z) of the vapour?

1. 0.974

2. 1.52

3. 1.22

4. 1.35

Q.

The compressibility factor for a real gas at high pressure is

1. 

2. 

3. 

4.