109.4g #Mg# contains how many moles?

1 Answer
Jun 16, 2018

Answer:

Well, what is the atomic mass of magnesium metal?

Explanation:

Is it not #24.31*g*mol^-1#. How did I know this? Did I know the mass from the top of my head?

And so we take the quotient, #"Mass of stuff"/"molar mass of stuff"#

#-=(109.4*cancelg)/(24.31*cancelg*mol^-1)=4.50*1/(1/(mol))=4.50*mol#