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frutty [35]
3 years ago
15

The most common source of copper (Cu) is the mineral chalcopyrite (CuFeS2). How many kilograms of chalcopyrite must be mined to

obtain 305 g of pure Cu? Express your answer to three significant figures and include the appropriate units.
Social Studies
1 answer:
schepotkina [342]3 years ago
5 0

Answer:

0.881 kilograms

Explanation:

Mass of Cu = 305 g

Molar mass of Cu = 63.546 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles= \frac{305\ g}{63.546\ g/mol}

Moles of Cu = 4.8 moles

Since in the formula of CuFeS_2,

1 mole of copper is present in 1 mole of CuFeS_2

So,

4.8 mole of copper is present in 4.8 mole of CuFeS_2

Moles of CuFeS_2 = 4.8 moles

Molar mass of CuFeS_2 = 183.53 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

4.8\ moles= \frac{Mass}{183.53\ g/mol}

Moles of CuFeS_2 = 881 g

Also, 1 g = 0.001 kg

So,

<u>0.881 kilograms of chalcopyrite must be mined to obtain 305 g of pure Cu.</u>

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