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convert to moles. then use avogradro's number \(6.022 \times 10^{23}\frac{ atoms }{ mol }\)

I do not know how to do this ..

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Do you have it now? Or do you still need help?

I don't know if 16.9994 is the answer?

Hang on. I'll figure it out

Okay thank you

No. Obviously no. It's way too small.

I have no clue what I am doing

Do you know what a mole is?

Not really

Do you understand that?

No, I am so sorry

Do you know how to find molecular weight?

I looked it up online

So I take that to be a yes?

Do you have a periodic table?

I looked up the weight online. and I do, yes

Find the molecular weight of HCl

36.46094

So a mole of HCl is 36.46094 grams.

Now here is the next important point: a mole of "stuff" has 6.023 x 10^23 molecules in it.

That's Avagadro's number. That is something you cannot reason out you have to learn it.

12

Would you agree that 2 moles is twice as much as 1 mole and so I should multiply by 2?

And
\[2(6.023 \times 10^{23)}=12.046 \times 10^{23}\]

So that is the number of molecules in 2 moles of carbon.

Ok. dimensionx will help you now. Too many cooks.

so we aren't really solving the entire equation because when I did that I had a ginormous number

Do you understand how I got this value?

yes.

So why isn't this problem done yet?

18 grams is 1 mole of water. How many moles is 9 grams of water?

.5

That would be 9/18 right?

yes

How many moles is 3 grams of water?

Just tell me the fraction.

50 g

3/18

I think I see a pattern here: I will draw it because I want you to see it too.

okay!

|dw:1364947152844:dw|

Do you see the pattern?

How many moles is 1 g water?

1/18

Very good.

What do you get?

hang on

my calculator says 0

|dw:1364947644414:dw|

I am not getting those numbers..

Type 6.023 divided by 18 equals

Did you get .334611111111 ??

yes.

So we will round it to .33
So now we have:
\[.33 \times 10^{23}\]

Oh! that mas sense

makes*

Of course!

Start with what is given: 1 g water

So if the units come out right, you know you have the numbers right.

so that would translate to 1 x 18/18= 1 x 6.023x10^23/18?

yes. multiply all the numerators and divide by all the denominators.

But the powers of 10...just leave that til the end.

33461*

Bingo!!

Me too.

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