stoich calculations

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5 Terms

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Moles/amount of substance

mass/molar mass

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mass (g)

moles x molar mass

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concentration

n = cv

where n = no. of moles

c = concentration (mol/dm³ or mol/L)

v = volume in dm³ or L

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using mass and conc. :

ex: calculate the mass (g) of NaOH needed to make 50cm³ of NaOH with a conc. of 2mol/dm³.

mass = molecular mass/moles

EX: CALCUALTION

Step 1: find mole using volume x conc.

mole = 0.05 (50 divided by 1000) x 2 = 0.1 mole NaOH

Step 2: Find mass using mole and Mr (molecular mass)

mass = 0.1 × 40 = 4g

Mass = 4g

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