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Chemistry 5070 · Cambridge (CAIE) O Level
Percentage Composition
4 past-paper questions on Percentage Composition · examined 2022–2025.
20251 question
5070/12 · M/J · Q11 [1]Sign up to mark my answer →
The formula of hydrated sodium carbonate is Na2CO3•10H2O. What is the percentage composition by mass of oxygen in hydrated sodium carbonate?
20232 questions
5070/11 · O/N · Q10 [1]Sign up to mark my answer →
Three compounds are listed. Which row shows the element that is present in the greatest percentage by mass in each compound?
5070/12 · M/J · Q11 [1]Sign up to mark my answer →
Which compound contains 45.2% nitrogen by mass? [Ar: C, 12; H, 1; N, 14]
20221 question
5070/21 · M/J · Q9(b)(ii) [2]Sign up to mark my answer →
Calculate the percentage by mass of nitrogen in ammonium nitrate.
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