CHEMISTRY DEPARTMENT

WAID ACADEMY

AVOGADRO

AND

THE MOLE

The mass of one mole of sodium is 23 g. What is the mass of one sodium atom?

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6.02 1023 g 6.02 10-23 g

3.82 x 10-24 g 3.82 x 10-23 g

1. 6.02 1023 g

2. 6.02 10-23 g

3. 3.82 x 10-24 g

4. 3.82 x 10-23 g

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What volume of oxygen, in litres, is required for the complete combustion of 1 litre of butane (C4H10)?

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1 litres 4 litres 6.5 litres 14 litres

1. 1 litres2. 4 litres3. 6.5 litres4. 14 litres

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Which of the following has the same volume as 32 g of sulphur dioxide (SO2) gas?(All volumes are measured under the same conditions of temperature and pressure).

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2 g of helium gas. 2 g of hydrogen gas.

20 g of neon gas. 32 g of oxygen gas.

1. 2 g of helium gas.

2. 2 g of hydrogen gas.

3. 20 g of neon gas.

4. 32 g of oxygen gas.

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The density of chlorine gas is found to be 3.00 g l-1.Under the experimental conditions, the molar volume, in litres is

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11.8 22.4 23.7 35.5

1. 11.8

2. 22.4

3. 23.7

4. 35.5

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Avogadro's constant is the same as the number of

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molecules in 1 mole of oxygen gas.

atoms in 1 mole of hydrogen gas.

ions in 1 mole of NaCl.

electrons in 1 mole of helium gas.

1. molecules in 1 mole of oxygen gas.

2. atoms in 1 mole of hydrogen gas.

3. ions in 1 mole of NaCl.

4. electrons in 1 mole of helium gas.

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160 g of calcium contains as many atoms as

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24 g of carbon. 92 g of sodium.

160 g of silver. 256 g of sulphur.

1. 24 g of carbon.

2. 92 g of sodium.

3. 160 g of silver.

4. 256 g of sulphur.

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From the equation below2KNO3(s) 2KNO2(s) + O2(s)Calculate the volume of oxygen formed when 0.05 mole of potassium nitrate decomposes.Take the molar volume of a gas to be 24 l mol-1.

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0.1 litres 0.2 litres 0.4 litres 0.6 litres

1. 0.1 litres

2. 0.2 litres

3. 0.4 litres

4. 0.6 litres

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The number of ions in 1 mol of copper(II) phosphate, Cu3(PO4)2, is

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1 2 4 5

1. 1

2. 2

3. 4

4. 5

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What volume of gas, in cm3, would be obtained by the reaction between 100cm3 of ammonia gas and excess copper(II) oxide? 2NH3 + 3CuO 3Cu + N2 + 2H2O

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50 100 200 400

1. 50

2. 100

3. 200

4. 400

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A mixture of magnesium bromide, MgBr2, and magnesium sulphate, MgSO4, is known to contain 3 mol of magnesium and 4 mol of bromide ions.How many moles of sulphate ions are present?

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1 2 3 4

1. 1

2. 2

3. 3

4. 4

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