A-LevelChemistryAtoms, molecules and stoichiometryOct/Nov 2014Paper 1 Q151 Mark
Use of the Data Booklet is relevant to this question. A sample of potassium oxide, K₂O, is dissolved in 250cm³ of distilled water. 25.0cm³ of this solution is titrated against sulfuric acid of concentration 2.00moldm⁻³. 15.0 cm³ of this sulfuric acid is needed for complete neutralisation. Which mass of potassium oxide was originally dissolved in 250 cm³ of distilled water?
A2.83 g
B28.3 g
C47.1 g
D56.6 g
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of atoms, molecules and stoichiometry within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep