Mass Transfer
H₂S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H₂S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is

2
0.56
1
1.56

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Relative volatility is reasonably constant
Mixture (to be separated) shows negative deviation from ideality
Multicomponent distillation is involved
Mixture (to be separated) shows positive deviation from ideality

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Mass Transfer
In saturated gas, the

Vapour is in equilibrium with the liquid at the room temperature
Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
None of the listed here
Vapour is in equilibrium with the liquid at the gas temperature

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