anonymous
  • anonymous
You have 20g of cobalt. How many atoms of cobalt is this?
Chemistry
jamiebookeater
  • jamiebookeater
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Xishem
  • Xishem
This is similar to the other question you asked. First convert from grams of Co to mols of Co, and then from mols of Co to atoms of Co using the knowledge that there are 6.022*10^23 of something in 1mol of something.
anonymous
  • anonymous
I got 5.65x10^21 atoms
Xishem
  • Xishem
Well, let's see... \[20g(Co)*\frac{1mol(Co)}{58.933g(Co)}=0.33937mol(Co)\]\[0.33937mol(Co)*\frac{6.022*10^{23}atoms(Co)}{1mol(Co)}=2.0437atoms(Co)=2.0*10^{23}atoms(Co)\]Do you see where you made your mistake?

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Xishem
  • Xishem
In the second set of equations, it should be...\[2.0437*10^{23}atoms(Co)=2.0*10^{23}atoms(Co)\]
Xishem
  • Xishem
Just remember to always make sure that your units make sense. If you follow your units, 90% of the time (especially in entry-level chemistry), you will be lead in the correct direction.

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