Question

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?

Answer 1

\[\frac{ 4.2 \times 10^{22}}{ N_{A} }\]

N_{A} is the avagadro number

Answer 2

yea sure :)

Answer 3

1mole of any substance has 6.022 x 10^23 particles of it

Answer 4

so 1 mole of Al has 6.022 x 10^23 atoms

Answer 5

well which one of those is true?
is 6.023x10^23 atoms of Al equal to 13 moles Al

Answer 6

now if 1 mole has 6.022 x 10^23 atom
then how many mole will have 4.2 x 10^22 atoms :)

Answer 7

can u calculate how many moles will have 1 atom?

Answer 8

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?

Answer 9

What's with the mass of aluminum? The origianl question just want number of moles.

Answer 10

ur saying B is correct cause it has got mass/
nvm its ok :)

Answer 11

But the original question was just "how many moles is 4.2 x 10^22 atoms".

Answer 12

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

Answer 13

yes

Answer 14

Or number 4 in your list

Answer 15

sure

Answer 16

2.03 X 10^24 atoms * 1 mole/6.023 x 10^23

Answer 17

Look carefully at my answer. You don't multiply both numbers.

Answer 18

number of moles = no of atoms /avagadro number :)

Answer 19

I made a graphic which shows the calculation more clearly:

Answer 20

yes :D

Answer 21

B it is!!

Answer 22

okay 1 more question.

Answer 23

np B)

Answer 24

moles=mass/molar mass

molar mass of silver=108

Answer 25

yea correct :D

Answer 26

Remember to learn how to set it up correctly.
What if you set it up as 107.9/68.3?

Answer 27

Yes you set it up the right way 68.3/107.9
but you will have to see why.

Answer 28

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?

Answer 29

So then you will definitely have to learn how to set up the answer.

Answer 30

Well imqwerty and myself looked at the answers and we're sure they are correct.

Answer 31

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

Answer 32

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)

Answer 33

#(
1mole of silver=108gm=6.022x10^23 particles
\[\frac{ 108\times 5.8 \times 10^{23} }{ 6.022 \times 10^{23}}=mass of (5.8 \times 10^{23})particles\]

Answer 34

^#9

Answer 35

I'm working on number 8

Answer 36

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)

Answer 37

yes sofia :) thas correct

Answer 38

So what is your answer for #8?

Answer 39

np :)

sofia can u tell how did u find out the mass

Answer 40

nvm :) tell ur method

Answer 41

Yes it is either B or C for #8

Answer 42

yes

Answer 43

ok :)

Answer 44

yes :D

Answer 45

np (:

Answer 46

Did you figure out #8 yet?

Answer 47

Yes it is C - very good!