Relative Atomic Mass(Ar), Relative Formula Mass(Mr) and Moles
Ar - Usually the same as the mass. Mr - Add up the Ar's. Moles - Relative atomic mass in grams.
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Percentages by Mass
Can use Ar and Mr to work out percentage of an element in a compound.
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Empirical Formula
1)Find the masses 2)Look up the Ar values 3)Find moles 4)Find the ratio(divide by smallest no)
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Calculating Reacting Masses
In a solution containing 100g NaOH, how much clorine gas will we need?
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Balancing Equations
N + H -> NH , Ca + O -> CaO, Br + Kl -> KBr + I
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Percentage Yield
A reaction may not go to completion because it is reversible. Some of the product may e lost when it is separated from the reaction mixture. Some of the reactant may react in ways different from the expected reaction.
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Other cards in this set
Card 2
Front
Can use Ar and Mr to work out percentage of an element in a compound.
Back
Percentages by Mass
Card 3
Front
1)Find the masses 2)Look up the Ar values 3)Find moles 4)Find the ratio(divide by smallest no)
Back
Card 4
Front
In a solution containing 100g NaOH, how much clorine gas will we need?
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