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Lukecrayonz
 4 years ago
How many atoms of Oxygen are there in 18g of water?
Lukecrayonz
 4 years ago
How many atoms of Oxygen are there in 18g of water?

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Xishem
 4 years ago
Best ResponseYou've already chosen the best response.1\[18g(H_2O)*\frac{1mol(H_2O)}{18.015g(H_2O)}=0.99917mol(H_2O)\]\[0.99917mol(H_2O)*\frac{1mol(O)}{1mol(H_2O)}=0.99917mol(O)\]\[0.99917mol(O)*\frac{6.022*10^{23}atoms}{1mol}=6.0atoms(O)\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Xishem, you almost had it. All the math save your last step is spot on, but the units must carry. 1 mol will cancel 1 mol, but 6.022x10^23 isn't really going anywhere. You'll have to figure out the exponent.

Xishem
 4 years ago
Best ResponseYou've already chosen the best response.1Pesky exponents. Here you go.\[0.99917mol(O)*\frac{6.022*10^{23}atoms}{1mol}=6.0*10^{23}atoms(O)\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0They might be pesky, but most professors will nail you on both exponents and unit labels. Regardless of the nature of the math.

Xishem
 4 years ago
Best ResponseYou've already chosen the best response.1I know :P It's easy to forget to write them on this site. I rarely miss them in writing.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0last semester I word processed my first chm hw assignment, after spending 4 hours doing it out long hand. just so that a class mate could have something to study off of.
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