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 is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.