anonymous
  • anonymous
How many nitrogren atoms are in a 3.75mg of Mg(NO3)2?
Chemistry
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SOLVED
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chestercat
  • chestercat
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aaronq
  • aaronq
find how many moles you have, then find how many molecules. Multiply the number of molecules by 2 because there are 2 N atoms in \(Mg(NO_3)_\color{red}{2}\)
anonymous
  • anonymous
Make sure to convert from mg-grams first.
anonymous
  • anonymous
So i just convert mg to grams then divide by molar mass and multiply by avogadros number? Then multiply by 2?

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aaronq
  • aaronq
correct
anonymous
  • anonymous
Wouldnt that give me the number of how many atoms in total time two and not just nitrogen? Because they gave me the mass of the entire compound
aaronq
  • aaronq
no, because when you multiply moles is in terms of the molecule. when you multiply times avogadros number, you find how many molecules (collections of Mg(NO3)2).
anonymous
  • anonymous
so when you said to find how many moles you meant moles of nitrogen not moles of the entire molecule?
anonymous
  • anonymous
by the way, isn't it a compound because magnesium is a metal?
aaronq
  • aaronq
moles of the entire molecule
aaronq
  • aaronq
very true. they're almost used interchangeably, but you're right.
anonymous
  • anonymous
ah, I'm sorry, it took me a while to understand. I think i just fully understood what you just said, thank you so much!
aaronq
  • aaronq
no problem !
goformit100
  • goformit100
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