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Mdcat-past-papers Quiz

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321. The number of moles of CO₂ which contains 8.00g of oxygen is:



322. 3.0 moles of calcium will contain ----g of calcium:



323. During stoichiometric calculations, which of the following laws must be followed?



324. The number of moles of water in 1kg of ice is:



325. How many moles of calcium carbonate are present in 77.5 kg of calcium carbonate? (Atomic mass of Ca = 40, C = 12, O = 16 → CaCO₃ = 100 g/mol)



326. 30 grams of 2-propanol were mixed with access acidified K2Cr2O7 and boiled under reflux for 20 min the organic product was than collected by distillation and 75% yield was obtained. What is the mass of product produced?



327. The same moles of H₂, N₂, and O₂ are present in 0.1 cc volume at STP. Which one has the greatest number of molecules?



328. Number of moles in an element is directly proportional to:



329. 3.0 g of Carbon on combustion gives: C+O₂→CO₂



330. Ratio of atomic mass of hydrogen to atomic mass of carbon is:



331. What volume of oxygen at STP is required to burn 500 dm³ of ethene?



332. 7.6g of CS₂ is reacted with 12.8g of O₂. Reaction: CS₂ + 3O₂ → CO₂ + 2SO₂ The limiting reactant is:



333. The total number of moles present in 2g of ethylene molecule (C₂H₄) are:



334. 9.8g of H₂SO₄ has been dissolved in excess water to ionize completely. How many H⁺ ions will it yield?



335. Al reacts with O₂ according to: 4Al + 3O₂ → 2Al₂O₃ 27g of Al will react with how much O₂?



336. One mole of a substance is the amount of that has the same number of particles as there are atoms in exactly:



337. Number of H₂O molecules in 10g of ice are:



338. The efficiency of a chemical reaction can be expressed as:



339. 1 mol of any substance contains -------- particles:



340. N₂(g) + 3H₂(g) → 2NH₃(g) How many moles of N₂ are required to manufacture 8 moles of NH₃?



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