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chemistry: amount of substance > Formulae and Equations > Flashcards

Formulae and Equations Flashcards

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AP® Chemistry flashcards Periodic Table flashcards
1
Q

What is the empirical formula?

A

simple whole number ratio of atoms of each element of a compound

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2
Q

How do we find the empirical formula?

A
  1. find mass of each element
  2. calculate number of moles : mass/Ar
  3. convert number of moles into whole number ratio by dividing by smallest value
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3
Q

What is the molecular formula?

A

actual number of atoms of each element in one molecule of the compound

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4
Q

How do we find the molecular formula?

A
  1. calculate relative mass of empirical
  2. find Mr
  3. Mr/relative mass of empirical
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5
Q

What equation is used to calculate percentage atom economy?

A

mass of desired product/mass of all reactants x 100

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6
Q

What equation is used to calculate percentage yield?

A

number of moles of specified product/maximum theoretical number of moles of product x100

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chemistry: amount of substance (3 decks)

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