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1 - Principles of chemistry (e) Chemical formulae, equations and calculations
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Total cards: 5•Content version: v4•Public deck•Updated: 8/1/2026
Card preview (5)
#1
Front (Question)
How do you calculate relative molecular mass/relative formula mass?
Back (Answer)
Add up all the atomic masses of all the atoms present in the molecule’s formula
#2
Front (Question)
What is the formula for moles, what are the units and rearrangements?
Back (Answer)
n = m / Mr m = n x Mr Mr = m / n n = Number of moles (mol) m = Mass (g) Mr = Molecular Mass
#3
Front (Question)
How do you calculate percentage yield?
Back (Answer)
Actual yield / Theoretical yield
#4
Front (Question)
What is empirical formula? What is molecular formula?
Back (Answer)
Empirical formula is the simplest form of the formula (e.g. Mg4Cl8 becomes MgCl2) Molecular formula is the ‘true’ formula, not changed, and it is the true amount and ratio
#5
Front (Question)
How would you find the (empirical) formula of a metal oxide by combustion?
Back (Answer)