Question

calculate the number of moles in 1.17 grams of NaCl

Answer 1

Hello there @meika ! just for future reference, you would want to post your question in the chemistry section of OpenStudy. For now, don't worry about it. Let's solve this problem

Answer 2

First of all, do you have any idea on how to start solving this problem?

Answer 3

no not really

Answer 4

alright :) so the first step to solving a problem like this is finding the molar mass of NaCl itself. And we do that by looking at the atomic mass on a periodic table

https://www.webelements.com

Answer 5

ok got that

Answer 6

Mass of Na: 23
Mass of Cl: 35.5

Mass of NaCl: 58.5

Answer 7

Parth >_>

Answer 8

Oh, sorry! Continue.

Answer 9

thats what i got

Answer 10

lol its fine xD so the atomic mass of NaCl would be that number that Parth had up there…then from there, you would set up a proportion to convert mass to moles.

Answer 11

so in this problem, we are given that there are 1.17 grams of NaCl. And we know that 1 mol of NaCl =58.5 grams. Now if we put this information together, we can set up a solvable proportion.

Answer 12

given mass divided by the mass of 1 mole of the element?

Answer 13

basically..ultimately, your proportion would end up looking like this:

\(\Large\frac{58.5g}{1 mol}=\Large\frac{1.17g}{x mol}\)

Answer 14

in this proportion , our aim is to solve for x

Answer 15

ok....will u be here later? i have to leave but i really want to finish this

Answer 16

I'll be here later…but I can just solve this right here and now so you can see the process when you get back alright?

Answer 17

ok

Answer 18

alright so I'll be writing the process right now… never mind me, feel free to leave if you need

Answer 19

So to go about solving a proportion, you cross multiply. Therefore, your proportion becomes: 58.5x=1.17

Then divide both sides by 58.5 to isolate the x variable. In the end, you should get that
x=0.02

Therefore, there are \(\underline{0.02~moles}\) in 1.17 grams of NaCl

Answer 20

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