The question asks us to determine the amount of chalcopyrite that would be requi

Question

The question asks us to determine the amount of chalcopyrite that would be required to produce 100 pennies each containing 30g of copper. In this step, we use the molar masses to write a chemical equation to convert grams of copper to grams of CuFeS_2? Using the equations below complete the missing information indicated by the tatters A and B to convert grams of Cu to grams of CuFeS_2? Finally, determine the actual number of grams of CuFeS_2 required to produce 100 copper pennies. 300 g Cu x 1 mol Cu/A g Cu x 1 mol Cu_2S/2 mol Cu x B mol CuS/1 mol Cu_2S x 2 mol CuFeS_2/2 mol CuS x 183.52 g CuFeS_2/1 mol CuFeS_2 - g CuFeS_2

Explanation / Answer

Note that, A is the molar mass of Cu, Copper

so, we know that 1 mol of Copper = 63.546 g

then A = 63.546

For B...

we need to relate mols of CuS = Cu2S

so ratio is 2 mol of CuS +S will form 1 mol of Cu2S

B = 2

finally

the operation:

300*1/63.546 *1/2 *2/1 *2/2 *183.52/1 = 866.3959 g of CuFeS2

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