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How many H2O molecules are there in a snowflake weighing 1 mg?

Asked by Topperlearning User 4th June 2014, 1:23 PM
Answered by Expert
Answer:

Snowflakes are made of water (H2O).The mass of 1 mole of water is calculated as follows:

Mass of H2O = 2(mass of H) + mass of O

Mass of H2O =2 (1.01g)   + 16.00g

Mass of H2O = 2.02g + 16.00g

Mass of H2O = 18.02 g

One mole of H2O contains 6.022×1023 molecules of H2O (Avogadro’s number)

Therefore, 1 g of H2O contains = (6.022×1023 H2O molecules) / (18.02g)

There are 3.34×1022 H2O molecules in 1g of H2O.

So snowflake weighing 1 mg contains = (3.34×1022 molecules) / (1000)

Hence, there are 3.34×1019 H2O  molecules in 1 mg snowflake.


Answered by Expert 4th June 2014, 3:23 PM
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