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What is Avogadro’s number and how is it related to the molecular mass of compounds? Explain with an example?

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The number 6.02 x 1023 is called Avogadro’s number. 

The mass, in grams of 6.02 x 1023 molecules of any substance is equal to its molar mass. In other words, molecules mass of any substance has 6.02 x 1023 molecules. 

For example, molecular mass of water H2O = 2 + 16 = 18 

.'. Molar mass of H2O = 18 g 

.'. In 18 g of H2O molecules, 

6.022 x 1023 molecules are there.

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