Answer:
319.3g Cu2S
Explanation:
There is 127.1 g Copper in 159.16g (molar mass) of Cu2S. Let x be Cu2S required. Then x * (127.1/159.16) = 255.0g. So x = 319.3g
The mass of Cu₂S needed is 319.25 g
We'll begin by calculating the mass of 1 mole of Cu₂S.
1 mole of Cu₂S = (2×63.5) + 32
= 127 + 32
Thus,
127 g of Cu is needed to produce 159 g of Cu₂S
Finally, we shall determine the mass of Cu₂S that can be obtained from 255.0 g Cu. This can be obtained as follow:
127 g of Cu is needed to produce 159 g of Cu₂S.
Therefore,
255.0 g Cu will produce = [tex]\frac{255 X 159}{127}[/tex] = 319.25 g of Cu₂S
Thus, 319.25 g of Cu₂S is needed.
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