Question

The most common source of copper (cu) is the mineral chalcopyrite (cufes2). How many kilograms of chalcopyrite must be mined to obtain 500. G of pure cu?

Answer 1

The amount of chalcopyrite must be mined to obtain 500g of pure Cu is 1.4 kilograms.

What is the relation between mass & moles?

Relation between the mass and moles of any substance will be represented as:

n = W/M, where

• W = given mass
• M = molar mass

Moles of Cu = 500g / 63.5g/mol = 7.87 mole

Given chemical reaction is:

CuFeS₂ → Cu²⁺ + Fe²⁺ + 2S²⁻

From the stoichiometry of the reaction, it is clear that

1 mole of Cu = produced by 1 mole of CuFeS₂

7.87 mole of Cu = produced by 7.87 mole of CuFeS₂

Mass of given moles of CuFeS₂ = (7.87mol)(183.5g/mol) = 1,444.14g = 1.4kg

Hence required mass of CuFeS₂ is 1.4 kg.

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