IMAT Stoichiometric calculations questions

Sample questions

1. 1IMAT Doutor

   A 5.0 g sample of impure calcium carbonate reacts with excess hydrochloric acid and releases 0.88 g of CO2. What is the percentage by mass of CaCO3 in the sample? (Mr: CaCO3 = 100, CO2 = 44)
   1. A20%
   2. B30%
   3. C40%
   4. D50%
   5. E80%
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2. 2IMAT 2024 Q36

   Given the theoretical reaction yield of 4 FeS₂ + 11 O₂ → 2 Fe₂O₃ + 8 SO₂ which of the following statements is correct
   1. AFrom 2 mol of FeS₂ and 11 mol of O₂, 1 mol of Fe₂O₃ can be obtained.
   2. BFrom 10 mol of O₂ and 1 mol of FeS₂, 3 mol of SO₂ can be obtained.
   3. CTo obtain 1 mol of Fe₂O₃, 2 mol of FeS₂ and 5 mol of O₂ are necessary.
   4. DFrom 4 mol of O₂ and 11 mol of FeS₂, 8 mol of SO₂ can be obtained.
   5. ETo obtain 1 mol of Fe₂O₃ and 6 mol of SO₂, 2 mol of FeS₂ and 9 mol of O₂ are necessary.
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