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5/96 MCQs for:
MATTER - PROPERTIES AND TRANSFORMATION: Principles Of Chemistry - Formulae, Moles And Equations
How many moles of sodium carbonate decahydrate are there in 10 g of a sample of it?
If the empirical formula of a compound is CH₂ and its relative molecular mass is 56, what is its molecular formula? (C=12, H=1)
What is the percentage by mass of water of crystallization in copper (II) sulphate pentahydrate?
What does the term 'stoichiometry' refer to in chemistry?

A compound made up of 80% carbon and 20% hydrogen has relative molecular mass 30.

What is the molecular formula of the compound?