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Question 4

Question

Question 4

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Step 1

Given,

Azurite is 2CuCO3.Cu(OH)2

Malachite is CuCO3.Cu(OH)2

1 mole of azurite, 2CuCO3.Cu(OH)2 contains 3 moles of Cu .

The percentage of copper in Azurite, 2CuCO3.Cu(OH)2 can be calculated as:

Molar mass of azurite = 2[63.5 + 12
(3x16)] +63.5 + 2x(16 + 1)= 344.5 g/mol
3 x Molar mass of copper
% of Cu in Azurite =
x 100%
Molar mass of azurite
(3 x 63.5)
% of Cu in Azurite
x 100%
_
344.5
% of Cu in Azurite = 55.3 %
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Molar mass of azurite = 2[63.5 + 12 (3x16)] +63.5 + 2x(16 + 1)= 344.5 g/mol 3 x Molar mass of copper % of Cu in Azurite = x 100% Molar mass of azurite (3 x 63.5) % of Cu in Azurite x 100% _ 344.5 % of Cu in Azurite = 55.3 %

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Step 2

1 mole of malachite, CuCO3.Cu(OH)2 contains 2 moles of Cu.

The percentage of copper in Mal...

Molar mass of malachite [63.5
63.5 + 2x(16 1) 221 g/mol
12 (3x16)]
2 x Molar mass of copper
% of Cu in Malachite =
x 100%
Molar mass of malachite
(2 x 63.5)
% of Cu in Malachite
x 100%
221
% of Cu in Malachite = 57.5 %
help_outline

Image Transcriptionclose

Molar mass of malachite [63.5 63.5 + 2x(16 1) 221 g/mol 12 (3x16)] 2 x Molar mass of copper % of Cu in Malachite = x 100% Molar mass of malachite (2 x 63.5) % of Cu in Malachite x 100% 221 % of Cu in Malachite = 57.5 %

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