Some Basic Concepts of Chemistry - Result Question 33

####33. How many millilitres of 0.5MH2SO4 are needed to dissolve 0.5g of copper (II) carbonate?

(1999, 3M)

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Solution:

  1. The equations of chemical reactions occurring during the process are

In the presence of oxygen

2PbS+3O22PbO+2SO2

By self reduction

2PbO+PbS3Pb+SO2

Thus 3 moles of O2 produces 3 moles of Pb

i.e. 32×3=96g of O2 produces 3×207=621g of Pb

So 1000g(1kg) of oxygen will produce

62196×1000=6468.75g =6.4687kg6.47kg

Alternative Method

From the direct equation,

PbS+O232gPb207g+SO2

So, 32g of O2 gives 207g of Pb

1g of O2 will give 20732g of Pb

1000g of 2 will give 20732×1000=6468.75g

=6.46875kg6.47kg



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