2019 A Level H2 Chemistry Paper 1 Question 11 - Determine Mole Ratio of Pb to B in Solder Glass
Let's take a look at 2019 A Level H2 Chemistry Paper 1 Question 11.
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.
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.
Similarly we can determine the number of moles of Pb from 84g of PbO.
Finally we can calculate the 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
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