anonymous
  • anonymous
If you were asked to convert 4.2 X 10^22 atoms of aluminum to moles, which of the following should you use for the conversion?
Mathematics
  • Stacey Warren - Expert brainly.com
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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!
imqwerty
  • imqwerty
\[\frac{ 4.2 \times 10^{22}}{ N_{A} }\] N_{A} is the avagadro number
imqwerty
  • imqwerty
yea sure :)
imqwerty
  • imqwerty
1mole of any substance has 6.022 x 10^23 particles of it

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imqwerty
  • imqwerty
so 1 mole of Al has 6.022 x 10^23 atoms
Mertsj
  • Mertsj
well which one of those is true? is 6.023x10^23 atoms of Al equal to 13 moles Al
imqwerty
  • imqwerty
now if 1 mole has 6.022 x 10^23 atom then how many mole will have 4.2 x 10^22 atoms :)
imqwerty
  • imqwerty
can u calculate how many moles will have 1 atom?
imqwerty
  • imqwerty
well just because it has that bad number 26.891... we can't say its wrng we have to give proper reasoning ok we know that 1mole has 6.022 x 10^23 particles we need to find how many moles will have 1 particle so 1st answer this- 6 bags have 3 chocolates how many bags will have 1 chocolate?
wolf1728
  • wolf1728
What's with the mass of aluminum? The origianl question just want number of moles.
imqwerty
  • imqwerty
ur saying B is correct cause it has got mass/ nvm its ok :)
wolf1728
  • wolf1728
But the original question was just "how many moles is 4.2 x 10^22 atoms".
wolf1728
  • wolf1728
There are 6.023 x 10^23 atoms per mole. You have 4.2 x 10^22 atoms. 4.2 x 10^22 * 1 mole/6.023 x 10^23 atoms
imqwerty
  • imqwerty
yes
wolf1728
  • wolf1728
Or number 4 in your list
wolf1728
  • wolf1728
sure
wolf1728
  • wolf1728
2.03 X 10^24 atoms * 1 mole/6.023 x 10^23
wolf1728
  • wolf1728
Look carefully at my answer. You don't multiply both numbers.
imqwerty
  • imqwerty
number of moles = no of atoms /avagadro number :)
wolf1728
  • wolf1728
I made a graphic which shows the calculation more clearly:
1 Attachment
imqwerty
  • imqwerty
yes :D
wolf1728
  • wolf1728
B it is!!
wolf1728
  • wolf1728
okay 1 more question.
imqwerty
  • imqwerty
np B)
imqwerty
  • imqwerty
moles=mass/molar mass molar mass of silver=108
imqwerty
  • imqwerty
yea correct :D
wolf1728
  • wolf1728
Remember to learn how to set it up correctly. What if you set it up as 107.9/68.3?
wolf1728
  • wolf1728
Yes you set it up the right way 68.3/107.9 but you will have to see why.
wolf1728
  • wolf1728
The important thing is if you know the correct way to set up the answer because I'm assuming you will be tested on this, right?
wolf1728
  • wolf1728
So then you will definitely have to learn how to set up the answer.
wolf1728
  • wolf1728
Well imqwerty and myself looked at the answers and we're sure they are correct.
wolf1728
  • wolf1728
Atomic mass of copper = 63.55 meaning there are 6.023 x 10^23 atoms for every 63.55 grams of copper. We need to know atoms in 68.7 grams of copper: 68.7 * 6.023 x 10^23 atoms / 63.55 grams copper = 6.511 x 10^23 atoms which is C which is your answer
wolf1728
  • wolf1728
Moles in 125 g of NI atomic mass Ni = 58.71 grams per mole 125 grams * 1 mole / 58.71 grams = 2.129 moles B (which is your answer)
imqwerty
  • imqwerty
#( 1mole of silver=108gm=6.022x10^23 particles \[\frac{ 108\times 5.8 \times 10^{23} }{ 6.022 \times 10^{23}}=mass of (5.8 \times 10^{23})particles\]
imqwerty
  • imqwerty
^#9
wolf1728
  • wolf1728
I'm working on number 8
wolf1728
  • wolf1728
It seems to me you just want correct answers as opposed to HOW to set up the answers. Question 8 - your answer is wrong. What is the mass of 25 atoms of mercury? (your answer)
imqwerty
  • imqwerty
yes sofia :) thas correct
wolf1728
  • wolf1728
So what is your answer for #8?
imqwerty
  • imqwerty
np :) sofia can u tell how did u find out the mass
imqwerty
  • imqwerty
nvm :) tell ur method
wolf1728
  • wolf1728
Yes it is either B or C for #8
imqwerty
  • imqwerty
yes
imqwerty
  • imqwerty
ok :)
imqwerty
  • imqwerty
yes :D
imqwerty
  • imqwerty
np (:
wolf1728
  • wolf1728
Did you figure out #8 yet?
wolf1728
  • wolf1728
Yes it is C - very good!

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