2019 A Level H2 Chemistry Paper 1 Question 11 - Determine Mole Ratio of Pb to B in Solder Glass

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Let's take a look at 2019 A Level H2 Chemistry Paper 1 Question 11.

2019 p1 q11 question

We are given that solder glass contains 16% of B2O3 and 84% of PbO.

Hence in 100g, there will be 16g of B2O3 and 84g of PbO.

2019 p1 q11 mass of B2O3 and PbO

From mass of B2O3, we can find its number of moles by dividing by molar mass.

We then compare mole ratio between B to B2O3 and determine number of moles of B.

2019 p1 q11 moles of B

Similarly we can determine the number of moles of Pb from 84g of PbO.

2019 p1 q11 moles of Pb

Finally we can calculate the mole ratio of Pb to B.

2019 p1 q11 mole ratio of Pb to B

Hence the answer to this question will be option A.

Topic: Mole Concept, Physical Chemistry, A Level Chemistry, Singapore

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

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