How many moles are in 15.5 g #SiO_2#?
About a 1/4 of a mole.
Silicon dioxide has a molar mass of
So to find the molar quantity of silicon dioxide, all I have to do is divide the mass by the molar mass:
By doing the equation with units included it helps to prevent me from making mistakes. Should I divide or should I multiply? The fact that the calculation gave me an answer in moles persuades me that I did the right thing. It's all too easy to make a mistake.
What is silicon dioxide? How do you calculate its molar mass?