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Total 1 mark 5 b avogadros constant and the mole

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–5–B.Avogadro’s Constant and the Mole concept (12 questions)1.How many hydrogen atoms are in one mole of ethanol, C2H5OH?(Total 1 mark)
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2.What is the number of oxygen atoms in one mole of CuSO4•5H2O?59(Total 1 mark)
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3.What is the total number of nitrogen atoms intwomol of NH4NO3?4
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(Total 1 mark)4.What is the total number of hydrogen atoms in 1.0 mol of benzamide, C6H5CONH2?A.B.6.0 × 1023C.3.0 × 1024D.4.2 × 10247
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–6–5.How many oxygen atoms are there in 0.20 mol of ethanoic acid, CH3COOH?
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(Total 1 mark)6.Which amount of the following compounds contains theleastnumber of ions?l23(Total 1 mark)
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7.How many molecules are present in a drop of ethanol, C2H5OH, of mass 2.3 × 10–3g?(L= 6.0 × 1023mol–1)19
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(Total 1 mark)8.Which sample of nitrogen gas, N2, contains the greatest number of nitrogen molecules?A.1.4 g NB.1.4 dm3of N2at 1.01 × 105Pa and 273 KC.1.4 × 1023N2moleculesD.1.4 mol N22
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–7–9.What is the mass, in g, of one molecule of ethane, C2H6?(Total 1 mark)
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10.Which sample has the greatest mass?
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(Total 1 mark)11.Which sample has the greatest mass?2O3
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(Total 1 mark)12.Ethanol (CH3CH2OH) is used as a component in fuel for some vehicles. One fuel mixturecontains 10 % by mass of ethanol in unleaded petrol (gasoline). This mixture is oftenreferred to as Gasohol E10. Assume that the other 90 % by mass of Gasohol E10 isoctane (C8H18).(a)Calculate the mass, in g, of ethanol and octane in 1.00 kg of the fuel mixture.

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