Stoichiometry
A very dilute solution is prepared by dissolving 'x1' mole of solute in 'x2' mole of a solvent. The mole fraction of solute is approximately equal to

1/x2
X1/x2
X2/x1
1 - (x1/x2)

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Stoichiometry
Pick out the wrong unit conversion of heat transfer co-efficient.

1 kcal/m².hr.°K = 1.163 W/m².°C
1 kcal/m².hr.°C = 0.2048 BTU/ft².hr. °F. = 1.163 W/m².°K
1 BTU/ft².hr.°F = 4.88 kcal/m².hr.°C = 20.44 kJ/m².hr°C = 5.678 W/m².°C
1 W/m² . °C = 0.1761 BTU/ft².hr.°F

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Stoichiometry
Pick out the wrong statement about the recycle stream in a process.

Recycling is exemplified by refluxing back a part of the distillate to the distillation column to maintain the quantity of liquid within the column
Recycling in a process stream helps in utilising the valuable reactants to the maximum with minimum loss of reactants
Recycling in a process does not help in getting higher extent of reaction
The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the quantity of the same reactant entering the process as fresh feed is called combined feed ratio

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