A-LevelChemistryChemical energeticsOct/Nov 2017Paper 1 Q71 Mark
The following data are needed for this question. ∆Hᶠ (P4O10(s)) = −3012 kJ mol⁻¹ ∆Hᶠ (H2O(l)) = −286 kJ mol⁻¹ ∆Hᶠ (H3PO4(s)) = −1279 kJ mol⁻¹ What is ∆Hº for the reaction shown? P4O10(s) + 6H2O(l) → 4H3PO4(s)
A-9844 kJ mol⁻¹
B-388 kJ mol⁻¹
C-97 kJ mol⁻¹
D+2019 kJ mol⁻¹
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of chemical energetics 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