How many moles of copper are needed to react with sulfur to produce 0.25 moles of copper sulfide

Explanation:

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In this case, the undergoing chemical reaction is:

In such a way, since it is already balanced, we develop the following stoichiometric dimensional analysis to find the moles of copper needed to react with sulfur to produce 0.24 moles of copper sulfide taking into account they have a 1 to 1 relationship, as shown below:

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the answer your looking for is c).