leahhhmorgannn
  • leahhhmorgannn
not getting any help in the Chemistry or Biology sections and I really have no idea how to do this calculation How many moles of silver (Ag) are present in a sample of 3.8 × 1024 atoms Ag? 1.6 mol Ag 2.3 mol Ag 6.3 mol Ag 22.8 mol Ag
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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Owlcoffee
  • Owlcoffee
An advice would be that a mole of any element contains \[N_a=6.02\times10^{23}mol\] where \(N_a\) signifies the number of atoms.
Owlcoffee
  • Owlcoffee
This means that in 1 mole of any sustance there is \(6,02\times10^{23} \) atoms.
leahhhmorgannn
  • leahhhmorgannn
see, I have this equation of 3.87 * (10^24) over 6.02 * (10^23) but I'm not sure on solving it. I'm not great with the conversions because I think the first part of this is atoms and they want moles?

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leahhhmorgannn
  • leahhhmorgannn
*3.8 sorry not 3.87
Owlcoffee
  • Owlcoffee
How about a rule of three? "if there is \(6,02\times10^{23}\) atoms in 1 mole, how many moles does \(3.8\times10^{24}\) molecules represent?" |dw:1450053766084:dw| Then, by cross multiplying: \[x=\frac{ (1)(6,02\times10^{23}) }{ 3,8\times10^{24} }mol\] so, try plotting that to your calculator, see what it gives as a result.
Owlcoffee
  • Owlcoffee
oops sorry, i made a mistake, it's: \[x=\frac{ 3,87\times10^{24} }{ 6,02\times10^{23} }\]
leahhhmorgannn
  • leahhhmorgannn
It always comes up with some e+ things. I don't get that.
Owlcoffee
  • Owlcoffee
oh yeah, instead of "x10" some calculators express "6,02e^23"
leahhhmorgannn
  • leahhhmorgannn
Oh, so that's all it is. It was confusing me the first few times I did these equations.
Owlcoffee
  • Owlcoffee
Yeah, it's all a matter of nomenclature.
leahhhmorgannn
  • leahhhmorgannn
when I put the equation into a calculator, it just comes out 3.87e+24 / 6.02e+23
leahhhmorgannn
  • leahhhmorgannn
sorry it took me a while, had to do something for my family.
leahhhmorgannn
  • leahhhmorgannn
@Owlcoffee
Owlcoffee
  • Owlcoffee
The result is about 6.4285714. So you should round it to the nearest 2nd decimal.
leahhhmorgannn
  • leahhhmorgannn
6.428 would round up to 6.43, right?
Owlcoffee
  • Owlcoffee
yes, choose the answer that is closest to that.
leahhhmorgannn
  • leahhhmorgannn
6.3, C?
Owlcoffee
  • Owlcoffee
yes, give it a try.
leahhhmorgannn
  • leahhhmorgannn
thanks for your help!
Owlcoffee
  • Owlcoffee
Anytime.

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