45.8g of H2O to atoms
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45.8g of H2O to atoms

[From: ] [author: ] [Date: 12-10-07] [Hit: ]
?Thanks-48.5g x (1mol / 18g) x (6.02 x 10^23 atoms / mol) = 1.There are 48.5 grams of H2O.......
This is a problem on my chemistry worksheet.
Need to convert from grams to atoms or molecules of H2O.
How to solve??
Thanks

-
48.5g x (1mol / 18g) x (6.02 x 10^23 atoms / mol) = 1.62 x 10^24 atoms

There are 48.5 grams of H2O. 18 grams make up 1 mole of H2O, so 48.5 grams makes up 2.69 moles of H2O. 1 mole of anything has 6.02 x 10^23 atoms (Avogadro's number), so 2.69 moles of H2O has 1.62 x 10^24 atoms.

My method of solving this question is called "dimensional analysis" or sometimes the "factor-label method." This method is commonly used in chemistry, so you should learn the concept and then practice it a lot until you are good at it because it is a very useful skill in science and math classes.
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