QUESTION 7 (Start on a new page.) The airbags in motor vehicles contain the compound sodium azide (NaNs). When a car crashes into an object, the compound decomposes and the nitrogen inflates the airbag. The balanced equation for the reaction is as follows: NaN(s) → 2Na(s) + 3N2(g) In one such decomposition, 2,53 x 10° molecules of nitrogen are generated. Calculate the: 7.1 Number of moles of NaN(s) that decomposed 7.2 Volume of N2(g) produced Assume that the reaction occurs at standard pressure. QUESTION 8 (Start on a new page.) Aluminium sulphate is used as a coagulant in water purification. It reacts with sodium hydroxide to form aluminium hydroxide which drags the impurities as it settles. The balanced equation for the reaction is: Al2(SO4)3(aq) + 6NaOH(aq) → 2Al(OH)3(s) + 3Na2SO4(aq) A chemist at a water purification plant adds 700 g of Al2(SO4)3 to a sample of water. 8.1 Calculate the maximum mass of Al(OH)3 that can be produced from this mass of Al2(SO4)3. (4) E [7] (5) The chemist now dissolves 0,85 mol of Na2SO4 in 250 cm³ of distilled water. He then tops it up with enough distilled water to make a 1 litre solution. 8.2 Define, in words, the term concentration of a solution. (2) 8.3 Calculate the concentration of this Na2SO4 solution. (3) [10] QUESTION 9 (Start on a new page.) The chemical reaction for the production of the drug, aspirin, from two compounds, X and Y, is represented by the balanced equation below. 2C-H6O3 + C4H6O32CgH8O4 + H₂O Y aspirin A chemist reacts 14 g of compound X with 10 g of compound Y. 9.1 Define the term limiting reactant in a chemical reaction. (2) 9.2 Perform the necessary calculations to determine which one of compound X or compound Y is the limiting reactant. (5) The actual mass of aspirin obtained is 11,5 g. 9.3 Calculate the percentage yield of the aspirin. (5) [12]
QUESTION 7 (Start on a new page.) The airbags in motor vehicles contain the compound sodium azide (NaNs). When a car crashes into an object, the compound decomposes and the nitrogen inflates the airbag. The balanced equation for the reaction is as follows: NaN(s) → 2Na(s) + 3N2(g) In one such decomposition, 2,53 x 10° molecules of nitrogen are generated. Calculate the: 7.1 Number of moles of NaN(s) that decomposed 7.2 Volume of N2(g) produced Assume that the reaction occurs at standard pressure. QUESTION 8 (Start on a new page.) Aluminium sulphate is used as a coagulant in water purification. It reacts with sodium hydroxide to form aluminium hydroxide which drags the impurities as it settles. The balanced equation for the reaction is: Al2(SO4)3(aq) + 6NaOH(aq) → 2Al(OH)3(s) + 3Na2SO4(aq) A chemist at a water purification plant adds 700 g of Al2(SO4)3 to a sample of water. 8.1 Calculate the maximum mass of Al(OH)3 that can be produced from this mass of Al2(SO4)3. (4) E [7] (5) The chemist now dissolves 0,85 mol of Na2SO4 in 250 cm³ of distilled water. He then tops it up with enough distilled water to make a 1 litre solution. 8.2 Define, in words, the term concentration of a solution. (2) 8.3 Calculate the concentration of this Na2SO4 solution. (3) [10] QUESTION 9 (Start on a new page.) The chemical reaction for the production of the drug, aspirin, from two compounds, X and Y, is represented by the balanced equation below. 2C-H6O3 + C4H6O32CgH8O4 + H₂O Y aspirin A chemist reacts 14 g of compound X with 10 g of compound Y. 9.1 Define the term limiting reactant in a chemical reaction. (2) 9.2 Perform the necessary calculations to determine which one of compound X or compound Y is the limiting reactant. (5) The actual mass of aspirin obtained is 11,5 g. 9.3 Calculate the percentage yield of the aspirin. (5) [12]
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Chapter1: Units, Trigonometry. And Vectors
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![QUESTION 7 (Start on a new page.)
The airbags in motor vehicles contain the compound sodium azide (NaNs). When a car
crashes into an object, the compound decomposes and the nitrogen inflates the airbag.
The balanced equation for the reaction is as follows:
NaN(s) → 2Na(s) + 3N2(g)
In one such decomposition, 2,53 x 10° molecules of nitrogen are generated.
Calculate the:
7.1
Number of moles of NaN(s) that decomposed
7.2
Volume of N2(g) produced
Assume that the reaction occurs at standard pressure.
QUESTION 8 (Start on a new page.)
Aluminium sulphate is used as a coagulant in water purification. It reacts with sodium
hydroxide to form aluminium hydroxide which drags the impurities as it settles.
The balanced equation for the reaction is:
Al2(SO4)3(aq) + 6NaOH(aq) → 2Al(OH)3(s) + 3Na2SO4(aq)
A chemist at a water purification plant adds 700 g of Al2(SO4)3 to a sample of water.
8.1
Calculate the maximum mass of Al(OH)3 that can be produced from this
mass of Al2(SO4)3.
(4)
E
[7]
(5)
The chemist now dissolves 0,85 mol of Na2SO4 in 250 cm³ of distilled water. He then
tops it up with enough distilled water to make a 1 litre solution.
8.2
Define, in words, the term concentration of a solution.
(2)
8.3
Calculate the concentration of this Na2SO4 solution.
(3)
[10]
QUESTION 9 (Start on a new page.)
The chemical reaction for the production of the drug, aspirin, from two compounds, X
and Y, is represented by the balanced equation below.
2C-H6O3 + C4H6O32CgH8O4 + H₂O
Y
aspirin
A chemist reacts 14 g of compound X with 10 g of compound Y.
9.1
Define the term limiting reactant in a chemical reaction.
(2)
9.2
Perform the necessary calculations to determine which one of compound X or
compound Y is the limiting reactant.
(5)
The actual mass of aspirin obtained is 11,5 g.
9.3
Calculate the percentage yield of the aspirin.
(5)
[12]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1da5fcb9-33b9-4710-b743-b3062f93bd0e%2Ff66f3a31-6ec3-40ce-a144-9ccb879b7470%2Fqc3jjwh_processed.jpeg&w=3840&q=75)
Transcribed Image Text:QUESTION 7 (Start on a new page.)
The airbags in motor vehicles contain the compound sodium azide (NaNs). When a car
crashes into an object, the compound decomposes and the nitrogen inflates the airbag.
The balanced equation for the reaction is as follows:
NaN(s) → 2Na(s) + 3N2(g)
In one such decomposition, 2,53 x 10° molecules of nitrogen are generated.
Calculate the:
7.1
Number of moles of NaN(s) that decomposed
7.2
Volume of N2(g) produced
Assume that the reaction occurs at standard pressure.
QUESTION 8 (Start on a new page.)
Aluminium sulphate is used as a coagulant in water purification. It reacts with sodium
hydroxide to form aluminium hydroxide which drags the impurities as it settles.
The balanced equation for the reaction is:
Al2(SO4)3(aq) + 6NaOH(aq) → 2Al(OH)3(s) + 3Na2SO4(aq)
A chemist at a water purification plant adds 700 g of Al2(SO4)3 to a sample of water.
8.1
Calculate the maximum mass of Al(OH)3 that can be produced from this
mass of Al2(SO4)3.
(4)
E
[7]
(5)
The chemist now dissolves 0,85 mol of Na2SO4 in 250 cm³ of distilled water. He then
tops it up with enough distilled water to make a 1 litre solution.
8.2
Define, in words, the term concentration of a solution.
(2)
8.3
Calculate the concentration of this Na2SO4 solution.
(3)
[10]
QUESTION 9 (Start on a new page.)
The chemical reaction for the production of the drug, aspirin, from two compounds, X
and Y, is represented by the balanced equation below.
2C-H6O3 + C4H6O32CgH8O4 + H₂O
Y
aspirin
A chemist reacts 14 g of compound X with 10 g of compound Y.
9.1
Define the term limiting reactant in a chemical reaction.
(2)
9.2
Perform the necessary calculations to determine which one of compound X or
compound Y is the limiting reactant.
(5)
The actual mass of aspirin obtained is 11,5 g.
9.3
Calculate the percentage yield of the aspirin.
(5)
[12]
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