Question

if 8.50 g of potassium combines with 7.71 g of chlorine to form potassium chloride, what is the percent of potassium in the potassium chloride?

Answer 1

potassium mass/whole mass x100% =

Answer 2

Thank you so much!

Answer 3

no prob

Answer 4

What do you mean divide by the whole mass?
What I did so far was get 39, which is potassiums atomic mass.

Answer 5

not atomic mass.. the masses the gave you in the problem, you're not dealing with moles here.

Answer 6

So would it be 8.50g/7.71g X 100% ?

Answer 7

nope at the bottom it should be both of the masses, since you're combining them, right?

Answer 8

Ok, so what should be at the top?

Answer 9

the mass of potassium?

Answer 10

I'm confused, so if the mass of potassium is 8.50g, that should be above, right? And your saying that I should combine both of the masses at the bottom? So would it look something like this:
8.50g/
(8.50g+7.71g)
X 100% ?

Answer 11

yep. it's like you have 12 cats and 3 dogs, and they ask you whats the percent of cats you have as pets?

12 cats/15 pets x 100% = 80% cats

Answer 12

Alright, I got it. Thanks for your help.

Answer 13

:)

Answer 14

no prob !