Stoichiometry Summary Compiled

# Stoichiometry Summary Compiled - Stoichiometric...

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Stoichiometric Relationships Summary 1 mole number of carbon atoms in exactly 12g of C-12. This quantity is equal to 6.022x10 23 and is known as Avogadro’s number. The molecular mass of a substance is the sum of the atomic masses of the individual atoms it contains and is expressed in amu’s (u). The term formula mass is used for the empirical formula of an ionic compound. The molar mass of any element or compound is equal to the sum of the molar masses of the individual atoms it contains. That sum will always equal 1 mole of that substance (i.e. 40.01g of NaOH = 1 mole of NaOH formula units or 6.022x10 23 units.) 1 mole of ANY gas at STP (standard temperature and pressure = 0 o C and 1atm) occupies a volume of 22.4 L. The concentration of a solution is commonly measured in a unit called Molarity (M). The units are moles of solute per liter of solution. A 1M solution has 1 mole of solute particles per liter of the total solution. Molarity can be affected by temperature since volume in involved in the unit. Molarity (M) = moles solute / liters of solution Another common unit of concentration is molality (m).

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Stoichiometry Summary Compiled - Stoichiometric...

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