Question

What is the mass in grams of 7.04 moles of potassium?

Answer 1

i'll give you a hint :) \[7.04 moles = molar mass of potassium/1mole\]

Answer 2

molar mass of potassium is 39.0983

Answer 3

oops sorry it should be

Answer 4

\[7.04 moles x molar mass of potassium/1 mole of potassium\]

Answer 5

I did 39.0983 * 7.04 to get 275.25 grams, is that correct?

Answer 6

(7.04 moles of potassium)(molar mass of potassium/1 mole of potassium)

Answer 7

yup that's right :)

Answer 8

Sweet, thanks

Answer 9

think of it as though you are converting units in math or in physics :)

Answer 10

you multiply it so that moles would be cancel :)

Answer 11

no problem :)

Answer 12

Moles = mass in grams / molar mass .
Now make mass the subject and re-write the formula as :
Moles *molar mass of potassium. :)
Hope this helps