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Percentage composition and empirical formula

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Total cards: 5•Content version: v4•Public deck•Updated: 8/1/2026

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#1
Front (Question)

What is empirical formula?

Back (Answer)

• Empirical formula is the simplest whole number ratio of each type of atom of a compound.

#2
Front (Question)

What is the molecular and empirical formula of glucose, methanoic acid, and ethanoic acid?

Back (Answer)

• Glucose:C6H12O6 = CH2O • Methanoic acid: HCOOH (or CH2O2) = CH2O2 • Ethanoic acid: CH3COOH (or C2H4O2) = C2H4O2

#3
Front (Question)

Empirical Formula Calculation

Back (Answer)

• Write down the mass of each element. • Look up the relative atomic mass of each element. • Work out how many Moles are of each element (divide by Ar) • Choose the element present in the smallest amount. • Divide the moles of each of the other elements in the compound by the moles of the one in the smallest amount.

#4
Front (Question)

Percentage mass Eq.

Back (Answer)

= total mass of element in the compound (x100)/total mass of compound

Card back image
#5
Front (Question)

Calculating empirical formula from percentage composition by mass

Back (Answer)

• Mass of each element in 100 grams acid. • Relative atomic mass of each element. • Convert to moles of each element. • Identify the element present in the smallest amount. • Divided by the smallest.