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10 (a) Buildings sometimes have water sprinklers to put out fires - Edexcel - GCSE Chemistry - Question 10 - 2023 - Paper 1
Question 10
10 (a) Buildings sometimes have water sprinklers to put out fires. The pipes in some water sprinklers are filled with nitrogen gas to prevent corrosion when the sys... show full transcript
Worked Solution & Example Answer:10 (a) Buildings sometimes have water sprinklers to put out fires - Edexcel - GCSE Chemistry - Question 10 - 2023 - Paper 1
Step 1
State what is meant by the term corrosion.
Answer
Corrosion refers to the process in which metals react with environmental elements such as oxygen and moisture, leading to deterioration or a breakdown of the metal. It often results in the loss of material from the surface, which can weaken structures and components.
Step 2
Calculate the maximum volume, in cm³, of nitrogen produced from 110 g of sodium azide.
Answer
To calculate the amount of nitrogen produced, we first need to determine the number of moles of sodium azide (NaN3) in 110 g:
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Calculate moles of sodium azide:
Molar mass of NaN3 = 65 g/mol
Number of moles = mass / molar mass = 110 g / 65 g/mol = 1.692 mol
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Use the stoichiometry of the reaction:
From the balanced equation, 2 moles of NaN3 produce 3 moles of nitrogen (N2).
Therefore, moles of N2 produced = (3 moles N2 / 2 moles NaN3) * 1.692 mol NaN3 = 2.538 mol N2
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Calculate the volume of nitrogen:
At the given conditions, 1 mol of gas occupies 24 dm³:
Volume of nitrogen (in dm³) = moles of N2 * volume per mol = 2.538 mol * 24 dm³/mol = 60.912 dm³
To convert to cm³:
60.912 dm³ = 60.912 * 1000 cm³ = 60912 cm³
So, the maximum volume of nitrogen produced from 110 g of sodium azide is 60912 cm³.