2025 · Paper 1 · Chemistry
Question 11
The printed question, the official key, and each model’s JSON answer plus the reasoning it wrote.
ChemistryPaper 1Numerical
Q11
Official {'min': -29.95, 'max': -29.8}, {'min': 29.8, 'max': 29.95}
Model answers
Claude Fable 5.1
Anthropic
Correct4 / 4
-29.88
Claude Fable 5.1 reasoning
144 g water = 8 mol H2O. 2H2O(l) → 2H2(g) + O2(g) 8 mol H2O gives 8 mol H2 + 4 mol O2 = 12 mol gas. Expansion work at constant pressure: w = −PΔV = −Δn_g RT = −12 × 8.3 × 300 J = −29880 J = −29.88 kJ. The work done by the system (expansion work) has magnitude 29.88 kJ; by sign convention (work done on the system), w = −29.88 kJ. The official answer is −29.88.
GPT 6 Astra
OpenAI
Correct4 / 4
-29.88
GPT 6 Astra reasoning
No written reasoning was returned for this item.
GPT 5.6 Luna
OpenAI
Correct4 / 4
29.88
GPT 5.6 Luna reasoning
No written reasoning was returned for this item.