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Understanding The Mole, Molar Mass and Mole Ratio
Understanding The Mole, Molar Mass and Mole Ratio
What is a Mole?
Avogadro Number
Calculating Percent Mass
Empirical Formula
Using Moles
Molar Mass
Ratio of Moles
Using Moles in Equation
Verify that total percentage = 100%
Use this table as a worksheet to compute the Molar Mass and % Composition of each compound.
Present your answers in equation form:
Molar Mass Na2SO4
gNa = 2 molNa x 22.99 g/molNa = 45.98 g Na
g S = 1 mol S x 32.07 g/mol S = 32.07 g S
g O = 4 mol O x 16.00 g/mol O = 64.00 g O
Molar Mass Na2SO4 = 142.05 g/mol
Percent Composition Na2SO4
%Na= (2x22.99g/142.05g/mol)x100 = 32.37%Na
%S = (1x32.07g/142.05g/mol)x100 = 22.58% S
%O = (4x16.00g/142.05g/mol)x100 = 45.05% O
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