The molecular mass of air, at standard pressure and temperature, is approximately 28.97 g/mol. Calculate the mass of 3.33 moles of air.
First, complete the unit conversion using dimensional analysis:
A • B/C
A: 3.33 mil air
B: 28.87 g air
C: 1 mol air

We are given:

Molar mass of air = 28.97 grams/mole

Amount of Air in question = 3.33 moles

Mass of 3.33 moles:

We know that:

mass = molar mass * number of moles

replacing the variables

mass = 28.97 * 3.33 moles

[the 'mole' in the numerator and the denominator will cancel out]

mass = 28.97 * 33.3 grams

mass = 96.47 grams

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.