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Mdcat-past-papers Quiz

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341. 1g of H₂ has:



342. One molecule of O₂ has the same mass as:



343. The reactant which is consumed first in a chemical reaction is called:



344. What Mass of CaCO₃ give 48.8 Liters measured at (STP) of CO₂ on strong heating



345. How many moles are there in 60g of sodium hydroxide (NaOH)?



346. Heating 24.8 g of copper carbonate (CuCO₃) in a crucible produced only 13.9 g of copper oxide (CuO). What is the percentage yield of copper oxide (CuO)?



347. Actual yield will reach the ideal (theoretical) value if the % yield of the reaction is



348. What is the mass of 50g of calcium carbonate (CaCO₃)?



349. How many grams of CO₂ can be produced by thermally decomposing 10 moles of ZnCO₃?



350. How many moles of NaCl are produced from 16.5g of HCl according to the neutralization reaction: HCl + NaOH → NaCl + H₂O



351. What mass of aluminium oxide (Al₂O₃) is produced from 18.5 g of Al metal, when it reacts completely with oxygen gas according to the following equation: 4Al + 3O₂ → 2Al₂O₃



352. Efficiency of chemical reaction can be checked by calculating:



353. When 4g of magnesium is heated in excess of oxygen, magnesium oxide (MgO) is formed. Calculate the theoretical yield of MgO



354. 0.5 molar solution of NaOH contains:



355. How many moles of CO₂ contain 16g of O₂?



356. Stichiometry is defined as:



357. The amount of products that is actually produced during a chemical reaction by performing experiment is called:



358. What is the mass of sulphur in 24.5 g H₂SO₄?



359. From the equation N₂ + 3H₂ → 2NH₃, how many moles of NH₃ are produced from 2.5 moles of N₂?



360. Ca + S → CaS If 2.0g of calcium and 4.0g of sulphur are available for reaction, then the amount of product formed is:



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