Considering the definition of molar mass, the number of moles of Ti and Fe₂O₃ are 0.087 moles and 0.11 moles respectively.
The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
The molar mass of a compound is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.
The molar mass of Ti is 204.37 g/mole.
You know the molar mass of the elements is:
So, the molar mass of the compound Fe₂O₃ is calculated as:
Fe₂O₃= 2× 55.85 g/mole + 3× 16 g/mole
Solving:
Fe₂O₃= 159.7 g/mole
You can apply the following rules of three:
moles of Ti= (17.8 grams× 1 mole)÷ 204.37 grams
moles of Ti= 0.087 moles
If by definition of molar mass 159.7 grams of Fe₂O₃ are contained in 1 mole, 17.8 grams of Fe₂O₃ are contained in how many moles of Fe₂O₃?
moles of Fe₂O₃= (17.8 grams× 1 mole)÷ 159.7 grams
moles of Fe₂O₃= 0.11 moles
Finally, the number of moles of Ti and Fe₂O₃ are 0.087 moles and 0.11 moles respectively.
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