Considering the definition of molar mass, the mass of 3.5 moles of O₂ is 112 grams.
Definition of molar mass
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 (also called Mass or Molecular Weight) 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.
Molar mass of O₂
In this case, you know the molar mass of the oxygen O is 16 g/mole.
So, the molar mass of the compound O₂ is calculated as:
O₂= 2× 16 g/mole
Solving:
O₂= 32 g/mole
Mass of 3.5 moles of O₂
Next, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 32 grams, 3.5 moles of the compound contains how much mass?
[tex]mass= \frac{3.5 molesx32 grams}{1 mole}[/tex]
mass= 112 grams
Finally, the mass of 3.5 moles of O₂ is 112 grams.
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