Chemistry
posted 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

Chemistry 
DrBob222
moles = grams/molar mass

Chemistry 
mysterychicken
How do I figure out the molar mass?
MC 
Chemistry 
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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