A ratio (or fraction) that represents the relationship between two different units.
The representative particle of a substance. It is the smallest unit of a substance that still retains that substance's properties and is the simplest way to write the formula of the substance without coefficients.
The mass of one mole of compound.
The mass of one mole of a molecular substance.
A measure of amount. 1 mole equals 6.02×1023 items of something. The number is so massive because moles are used to measure the amount of molecules, atoms, and other incredibly miniscule particles.
The ratio between any two constituents in chemical equation
The arbitrarily decided standard conditions at which experiments are done: 1 atm and 273 degrees Kelvin (0 degrees Celsius).
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Moles = molality × kilograms of solution
Moles = molarity × liters of solution
