A-LevelChemistryAtoms, molecules and stoichiometryOct/Nov 2017Paper 1 Q31 Mark
The airbags in cars contain sodium azide, NaN3, and an excess of potassium nitrate, KNO3. In a car accident, the reactions shown occur, producing nitrogen. This causes the airbag to inflate rapidly. 2NaN3 → 2Na + 3N2 10Na + 2KNO3 → K2O + 5Na2O + N2 How many moles of nitrogen gas are produced in total when 1 mol of sodium azide, NaN3, decomposes in an airbag?
A1.5
B1.6
C3.2
D4.0
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The correct answer is B. This question tests the candidate's understanding of atoms, molecules and stoichiometry within the Chemistrysyllabus. The examiner's mark scheme requires...
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