The mass of air : 96.5 g air
Further explanation
Given
The molecular mass of air, at STP : 28.97 g/mol.
3.33 moles of air
Required
The mass
Solution
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
mol = mass : molar mass
mass = mol x molar mass
Input the value :
mass = 3.33 moles air x 28.97 g air/1 mol air
mass = 96.47 g ≈ 96.5 g air
