Stoichiometry
Size range of the colloidals particles is

500 - 1000 microns
5 - 200 milli-microns
10 - 50 Angstrom
50 - 200 microns

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Stoichiometry
Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m³ . The diffusivity of aniline in air is 0.74xl0⁻⁵m²/s.The numerical value of mass transfer co-efficient is 7.4 x 10⁻³. The rate of evaporation of aniline is 2.97 x 10⁻⁴. Its units are

Kmole/m² . s
Mole/m² . s
Mole/s
Mole/cm². s

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Stoichiometry
Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because

The strong base and strong acid reacts completely
The strong base and strong acid reacts in aqueous solution
Only OH⁻ and H⁺ ions react in every case
The salt formed does not hydrolyse

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