Asked by mysterychicken

I..don't understand any of this:

43. How many moles are in 25.0 grams of potassium? Show your work and round your answer to the appropriate number of significant figures.

Please, please help with this!
Thanks
-MC
Answered by DrBob222
moles = grams/molar mass
Answered by mysterychicken
How do I figure out the molar mass?

-MC
Answered by DrBob222
Look up the atomic mass of each element and add.
molar mass NO = about 30.
N = 14 is atomic mass.
O = 16 is atomic mass.
total = 30 = molar mass.
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