Question

Mols in 222 grams of CaCl2

Answer 1

To convert from grams to moles, you will need to use the molar mass.

Do you know how to calculate the molar mass of CaCl2 from a periodic table?

Answer 2

wasn't it Agravado's Number

Answer 3

Avogadro's number is for converting from grams to numbers of molecules

To find the molar mass, you have to use the periodic table

And do you notice how each element in the periodic table will have an atomic weight listed?

So you have to add it up for whatever compound you're looking at

So for CaCl2

you would find Ca and add it's atomic weight with Cl's atomic weight
And since we have 2 Cls' we have to add the atomic weight of Cl again

That would be your molar mass for CaCl2

Does that make sense?

Answer 4

it does, thanks AZ

Answer 5

Here is a periodic table that lists the atomic weight
https://ptable.com/#Properties

So can you tell me what the molar mass is for CaCl2?

(Also if you're ever too lazy to look at the periodic table and add it up, you can always just google "molar mass of CaCl2" and it'll tell you for most of the compounds)

Answer 6

ight for my answer I got 115.604

Answer 7

which would've been 40.076 (Ca)^2 + 35.45

Answer 8

It should be

40.076 + 35.45 + 35.45 = ??

That would be the molar mass

That tells you how many grams of CaCl2 would make 1 mole of CaCl2

Answer 9

So add those numbers and tell me what you get

and then to convert 222 grams to moles

you would just do

222 grams * 1 mole/ (that number you just added up to get) grams

and so grams and grams cancel out

so you're basically dividing 222 by that number to convert it to moles

does that make sense? @0mega

Answer 10

yes it does, I posted my answer above my equation from earlier

Answer 11

your answer is not correct

Answer 12

115.604?

Answer 13

dang I searched it I must've added incorrectly

Answer 14

yeah, how did you get that? That's not the molar mass nor is it your final answer

First let's find the molar mass

what is

40.078 + 35.45 + 35.45 = ??

Answer 15

it would be 110.98, I must've did 40.078 + 40.078 + 35.45

Answer 16

okay yeah, and now after you add it, you have to do the division so

Answer 17

That's the final step to convert from grams to moles

You use the molar mass

That 110.98 tells you that 110.98 GRAMS of CaCl2 is equal to 1 MOLE of CaCl2

Answer 18

thanks AZ I understand this perfectly