Neco Model Questions Vol1 2020 Chemistry Question 18
Practice objective / multiple choice question 18 from the 2020 Neco Model Questions Vol1 Chemistry examination.
A 1.00 g sample of impure white phosphorus (P₄) containing 90 % P₄ by mass is burnt completely in excess O₂. The calorimeter records a heat release of 2.90 kJ for the sample. (i) Determine the heat released per mole of pure P₄. (ii) Using the reaction \( \text{P}_4 + 5\text{O}_2 \rightarrow \text{P}_4\text{O}_{10} \), calculate the standard enthalpy of formation of \( \text{P}_4\text{O}_{10}(s) \). (iii) State whether the formation of \( \text{P}_4\text{O}_{10} \) is exothermic or endothermic.
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This is Neco Model Questions Vol1 2020 Chemistry Question 18. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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