Igcse Model Questions Vol1 2017 Chemistry Question 22
Practice objective / multiple choice question 22 from the 2017 Igcse Model Questions Vol1 Chemistry examination.
The gas X₂ reacts with excess O₂ according to the equation \(X_2 + 3 O_2 \rightleftharpoons 2 XO_3\). At 298 K the equilibrium constant for the reverse reaction \(2 XO_3 \rightleftharpoons X_2 + 3 O_2\) is \(K_c = 2.5 \times 10^{-4}\). In a 2.00 L sealed container, 0.200 mol of X₂ and 0.600 mol of O₂ are placed and allowed to reach equilibrium. (a) Calculate the equilibrium concentration of XO₃ (in mol L⁻¹). (b) The molar mass of XO₃ is 80 g mol⁻¹. From this information, identify the element X.
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About This Question
This is Igcse Model Questions Vol1 2017 Chemistry Question 22. It is one of the objective questions from the 2017 Igcse Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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