407 grams of Al2O3 to moles?
How many moles are in 407 grams of Al2O3?
3.99 moles Al₂O₃
Explanation:
2(26.98 g/mol) + 3(16.00 g/mol) = 101.96 g/mol
Since it is 101.96 grams PER one mole, the 101.96 is beside grams in the ratio. When setting up the conversion, you want grams in the denominator (molar mass ratio) to cancel out the grams in the numerator (given value). Since the given number has 3 significant figures, the answer should also have 3 significant figures.
407 grams Al₂O₃ 1 mole Al₂O₃ -------------------------- x -------------------- = 3.99 moles Al₂O₃
101.96 grams