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Organic Chemistry

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13 Mar 2010 23:25:51 IST

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What is Active Mass?

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What is Active Mass?

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winx

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Joined: 28 Jan 2010

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14 Mar 2010 09:41:59 IST

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active mass iz "da amount of substance in the sphere of action" or in other words itz "da effective concentration of a substance."

For species in solution active mass is equal to concentration.

For solids active mass is taken as a constant ----> regarded as empirical constants, to be determined by experiment.

edison

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30 Jan 2011 22:01:52 IST

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LAW OF MASS ACTION

This law relates rate of reaction with active mass or molar concentration of reactants.

At a given temperature, the rate of a reaction at a particular instant raised to powers which are numerically equal to the numbers of their respective molecules in the stoichiometric equation describing the reaction."

Active mass = molar concentration of the substance

= (number of gram moles at the substance)/(volume in litres)

= (w/M)/V=n/V

where w = mass of substance and 'M' is the molecular mass in grams. 'n' is the number of g moles and V is volume in litres.

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