Neco Model Questions Vol1 2021 Chemistry Question 11
Practice objective / multiple choice question 11 from the 2021 Neco Model Questions Vol1 Chemistry examination.
Four non‑metals X, Y, Z and W form the oxides \(X_{2}O_{3}\), \(Y_{2}O_{5}\), \(ZO_{2}\) and \(WO_{3}\) respectively. Their standard enthalpies of formation (\(\Delta_{f}H^{\circ}\)) are -800 kJ mol⁻¹ for \(X_{2}O_{3}\), -1200 kJ mol⁻¹ for \(Y_{2}O_{5}\), -400 kJ mol⁻¹ for \(ZO_{2}\) and -950 kJ mol⁻¹ for \(WO_{3}\). The atomic masses are: X = 30 g mol⁻¹, Y = 45 g mol⁻¹, Z = 60 g mol⁻¹ and W = 75 g mol⁻¹. Which oxide releases the greatest amount of heat per gram of oxide formed?
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About This Question
This is Neco Model Questions Vol1 2021 Chemistry Question 11. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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