A mole is a unit in chemistry used to express amounts of a chemical substance. 

1 mole of ANY substance is equal to 6.022 × 10²³ particles. This number is called Avogadro's number. 

To find how much moles a sample has, you need to convert from grams to moles. 

The molar mass of a substance is the mass (in grams) of 1 mole of that substance. Numerically, a substance's molar mass (in g/mol) is equal to its atomic or molecular mass in amu. 

To clarify the difference between grams and moles, grams measure mass, while moles help measure the number of particles based on molar mass. Moles serve as a medium for conversions and facilitate calculations using ratios.

1 Step Conversions: 

Grams to Particles Conversion: 

Moles to Liters (Gases at STP): 

In STP conditions, you could convert moles of a gas to liters. 

• Standard Temp. and Pressure (STP): 1 atm, 273 K.