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Amount of Substance

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

Card preview (8)

#1
Front (Question)

What is Ar

Back (Answer)

Mean mass of an atom of an element, divided by one twelth of the mean mass of an atom of the carbon-12 isotope

#2
Front (Question)

What is Mr

Back (Answer)

The mean mass of a molecule of a compound, divided by one twelfth of the mean mass of an atom of the carbon-12 isotope

#3
Front (Question)

Number of particles be found?

Back (Answer)

Moles x avogadros constant

#4
Front (Question)

Ideal gas equation and units

Back (Answer)

pV = nRT p = pascals v = m^3 T = kelvin m = grams

#5
Front (Question)

Percentage yield equation

Back (Answer)

(Actual mass / theoretical mass) x 100

#6
Front (Question)

Atom economy equation

Back (Answer)

(Mr of desired product / Mr of reactants) x 100

#7
Front (Question)

How to work out uncertainty?

Back (Answer)

Smallest scale division (or range for multiple readings) / measured value x 100

#8
Front (Question)

How to calculate percentage error?

Back (Answer)

(Uncertainity / value) x 100 If a reading is taken twice, uncertainity is doubled