# What is avogadro's hypothesis?

**Answer:**

It is: Equal volumes of gases, at the same temperature and pressure, contain the same number of particles, or molecules.

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Avogadro's number: number of atoms in exactly 12g of Carbon (6.02 x 10^23), is equivalent to 1 mol of a substance.

His hypothesis is that in counting Avogadro's number (N), of peas, if all the people now alive on earth, (5.6 billion) started counting Avogadro's number of peas at a rate of 2 peas per second, it would take approximately 1.7 million years.

It corresponds to the number of atoms or molecules needed to make up a mass equal to the substance's atomic or molecular mass, in grams.

It's equal to 6.02214179 x 10^23. (ten to the power of 23.)

The Italian Avogadro claimed that equal volumes of gases under the same conditions contained equal numbers of molecules. More importantly now, we know that 1 mole (the formula mass expressed in grams such as 2 grms oh H2 or 207 grm of Pb) of anything contains 6 X 10^23 particles (630000000000000000000000 partuicles).

This is Avogardo's number.

According to Berzielius... equal volume of all the gases contain equal number of ATOMS under similar condition of temp. and pressure.

But latter on it was modified by Avogathro's and put forward a hypothesis called Avogathro's law or hypothesis.

Acc. to which..."under similar condition of temp. and pressure, equal volume of all the gases contain equal number of Molecules."

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