How many H_(2)O molecules are there in a snowflake weighing 1 mg?

1.	How many H_(2)O molecules are there in a snowflake weighing 1 mg?
Answer» `3.35xx10^(19)` `6.023xx10^(23)` `3.35xx10^(19)` 100 Solution :1 mg `H_(2)O` Molar mass of `H_(2)O`=2+16=18g 1 Mole CONTAINS `6.023 xx 10^(23)` water MOLECULE 18 g contains `6.023 xx 10^(23)` water molecule `:.` 1 mg contains `(6.023xx10^(23))/18xx1g//1000mg=3.35xx10^(19)H_(2)O` molecule.

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