Stoichiometry
Which of the following has the smallest least effect on the solubility of a solute into the solvent?

Pressure
Nature of the solute
Nature of the solvent
Temperature

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Stoichiometry
Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the

Sizes of the component molecules are approximately equal
All of these
Component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution
Attractive forces between like and unlike molecules are approximately equal

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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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