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WorksheetsSTOICHIOMETRY_PART_2
Total questions: 10
Worksheet time: 11mins
Diagram shows the chemical formula of potassium hexacyanoferrate(II) trihydrate.
What is the relative mass of this compound?
[Relative atomic mass : H =1; C= 12; N= 14; O= 16; K= 39; Fe = 56]
141
256
389
422
What is the mass of phosphorus that contains twice the number of atoms found in 14 g of iron?
[Relative atomic mass : P = 31; Fe = 56]
62.0 g
28.0 g
15.5 g
10.7 g
Gas jar X contains 10g of oxygen gas while gas jar Y contains 10g of chlorine gas.
Which of the following statements is true about chlorine and oxygen gas in gas jars X and Y?
The number of gas molecules in both gas jars are the same.
The distance between the molecules in gas jar Y is greater than that of gas jar X.
Gas jar X contains greater number of moles of gas.
The volumes of the two gases are the same.
4.16 g of element W reacts with 1.92 g of oxygen to form metal oxide W. The empirical formula for this metal oxide is W2O3. What is the relative atomic mass of W?
[Relative atomic mass : O = 16]
27
52
56
104
The following chemical equation shows the heating of hydrated magnesium sulphate.
MgSO4.7H2O (s) → MgSO4 (s) + 7H2O (g)
What is the number of moles of water vapour released when 54 g of magnesium sulphate is produced during the heating of hydrated magnesium sulphate?
[Relative atomic mass : Mg = 24; S = 32; O =16]
0.45 mol
3.15 mol
4.50 mol
6.30 mol
Which of the following statements is true for one mole of a substance?
1 mol of magnesium contains 6.02 × 1023 molecules
1 mol of nitrogen gas contains 6.02 × 1023 atoms
1 mol of water contains the same number of atoms as in 12 g of carbon-12
1 mol of carbon dioxide contains the same number of molecules as the number of atoms in 12 g of carbon-12
How many moles of ions are there in 1 mole of iron(III) oxide?
2
3
5
6
0.58 g flavouring substance is used to improve the taste of a pineapple cake.
What is the number of molecules of the flavouring substance?
[Relative molecular mass of flavouring substance
= 116 gmol–1;
Avogadro constant = 6.02 × 1023 mol–1]
1.20 × 1026
3.01 × 1021
3.32 × 10–22
8.31 × 10–27
The following equation represents the reaction between aluminium and oxygen.
4Al + 3O2 → 2Al2O3
Which of the following statements is correct?
4 mol of aluminium atoms react with 3 mol of oxygen molecules
4 mol of aluminium atoms react with 3 mol of oxygen atoms
4 mol of aluminium atoms react with 3 mol of oxygen atoms producing 2 mol of aluminium oxide
4 mol of aluminium atoms react with 6 mol of oxygen molecules producing 2 mol of aluminium oxide
What is the number of atoms in 0.5 mol of ammonia gas? [Avogadro constant = 6.02 × 1023 mol–1]
6.02 × 1023
0.5 × 6.02 × 1023
0.5 × 2 × 6.02 × 1023
0.5 × 4 × 6.02 × 1023
