Lukecrayonz
  • Lukecrayonz
How many atoms of Oxygen are there in 18g of water?
Chemistry
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
Xishem
  • Xishem
\[18g(H_2O)*\frac{1mol(H_2O)}{18.015g(H_2O)}=0.99917mol(H_2O)\]\[0.99917mol(H_2O)*\frac{1mol(O)}{1mol(H_2O)}=0.99917mol(O)\]\[0.99917mol(O)*\frac{6.022*10^{23}atoms}{1mol}=6.0atoms(O)\]
anonymous
  • anonymous
Xishem, 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
  • Xishem
Pesky exponents. Here you go.\[0.99917mol(O)*\frac{6.022*10^{23}atoms}{1mol}=6.0*10^{23}atoms(O)\]

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anonymous
  • anonymous
They might be pesky, but most professors will nail you on both exponents and unit labels. Regardless of the nature of the math.
Xishem
  • Xishem
I know :P It's easy to forget to write them on this site. I rarely miss them in writing.
anonymous
  • anonymous
last 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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