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10 questions from this quiz
Proportion by mass of each element
mass of Amolar mass×100\frac{\text{mass of A}}{\text{molar mass}}\times100molar massmass of A×100
Simplest whole-number atom ratio
CH2\text{CH}_2CH2
Write down masses of all elements
Treat as masses in 100 g of compound
Divide by the smallest number
Decide which fertiliser has most N/kg
Blue to white
Up to 10%
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