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Question of chapter : Quantities and the Chemical Reactions

1. How many grams of carbon in 70.0 g CO2?
   20.09 g15.09 g17.09 g19.09 g
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2. How many grams of Cl2 can be prepared from the reaction of 15.0 g of MnO2 and 50.0 g of HCl according to the chemical equation: MnO2 + 4HCl --> MnCl2 + Cl2 + 2H2O
   10.24 g8.24 g12.24 g13.24 g
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3. Formaldehyde has the formula CH2O. How many molecules are there in 5.5 g of CH2O?
   15.04 X 10 22 molecule11.04 X 10 20 molecule15.04 X 10 19 molecule11.04 X 10 22 molecule
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4. How many grams of aluminum (Al) are required to complete reaction with 87.0 g of Cr2O3, as the following reaction 2Al + Cr2O3 --> Al2O3 + 2Cr
   29.91 g27.91 g30.91 g32.91 g
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5. What is the mass of 0.85 mol SO2?
   53.4 g52.4 g57.4 g54.4 g
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6. Determine the number of moles of calcium in 14.6 g Ca.
   3.37 g0.37 g4.37 g0.37 g
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7. If the reaction of 117 g of ammonia with excess oxygen gas yields 73 g of nitric oxide (NO), what is the percent yield of this reaction? 4NH3(g) + 5O2(g) --> 4NO(g) + 6H2O(g)
   33.36 %35.36 %38.36 %34.36 %
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8. How many silicon atoms are there in 7.5 g of silicon (Si)?
   17.13 X 10 21 atom16.13 X 10 21 atom17.13 X 10 22 atom16.13 X 10 22 atom
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9. How many sodium atoms are there in 7.5 g of Na2 CO3 ?
   8.52 X 1022 atom8.52 X 1024 atom5.52 X 1022 atom5.52 X 1018 atom
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10. When 57.0 g NaCl and 100.0 g H2SO4 are mixed and react according to the equation:
    2NaCl + H2SO4 --> Na2SO4 + 2HCl
    which is the limiting reagent?
    H2SO4HClNa2SO42NaCl
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11. Determine the number of moles of aluminum oxide in 182 g Al2O3.
    1.784 mol Ca1.804 mol Ca1.774 mol Ca1.814 mol Ca
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12. What is the mass of 0.91 mol nickel (Ni) l ?
    55.19 g54.69 g53.69 g53.19 g
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13. How many water molecules are there in 2.75 g of H2O ?
    5.2 X 1025 molecule5.2 X 1022 molecule9.2 X 1024 molecule9.2 X 1022 molecule
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14. How many grams of Ca in 34.0 g Ca3(PO4)2 ?
    13.16 g12.16 g13.66 g14.66 g
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15. How many grams of sulphur in 39.0 g Fe2(SO4)3 ?
    10.37 g8.87 g9.37 g10.87 g
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16. How many grams of Nitrogen in 104.0 g NH4NO3 ?
    36.4 g36.9 g34.9 g35.4 g
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