Question

A chemist weighed out 101. g of potassium. Calculate the number of moles of potassium she weighed out.

Round your answer to 3 significant digits.

Answer 1

(1mol/31.1g)(101g)=3.25

Answer 2

For problems like these, use the molar masses.

Answer 3

Then set it up so you're left in the unit's you need.(Ex: in the problem above, grams cancels)

Answer 4

Thanks!