2019 A Level H2 Chemistry Paper 1 Question 7 - Determine Gas Volume Using Ideal Gas Equation

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Here's question 7 from 2019 A Level H2 Chemistry Paper 1:

2019 p1 q7 question

We are required to determine the volume of nitrogen gas produced by the decomposition of sodium azide in airbags.

Given that the products are sodium metal and nitrogen gas, we can work out the balanced equation for this decomposition.

2019 p1 q7 balanced equation

We can find the number of moles of sodium azide from its mass, which is 0.07692 mol.

Comparing mole ratio of nitrogen gas to sodium azide, we can calculate the amount of nitrogen gas to be 0.1153 mol.

2019 p1 q7 moles of nitrogen gas

We can then make use of Ideal Gas Equation to determine volume of nitrogen gas.

2019 p1 q7 determine volume using ideal gas equation

Take note all the terms have to be in SI units:

P is pressure in Pa
V is volume in m3
n is number of moles
R is gas constant 8.31 J K-1 mol-1
T is temperature in K

Finally we have to convert volume from m3 to dm3 making use of the following conversion:

1 m3 = 1000 dm3

Therefore the answer to this question will be option D.

Topic: Gaseous State, Physical Chemistry, A Level Chemistry, Singapore

Back to list of questions for 2019 A Level H2 Chemistry Paper 1

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