How much 5.0 M nitric acid (HNO3) in mL, is needed to make 225 mL of 1.0 M HNO3?

The answer to your question is 45 ml

Explanation:

Data

Molarity 1 = 5 M

volume 1 = ?

Molarity 2 = 1 M

volume 2 = 225 ml

Formula

             Molarity 1 x volume 1 = Molarity 2 x volume 2

-Solve for volume 1

             volume 1 = Molarity 2 x volume 2 / Molarity 1

-Substitution

             volume 1 = (1 x 225) / 5

-Simplification

             Volume 1 = 225/5

-Result

             Volume 1 = 45 ml

-Conclusion

45 ml are needed to prepare 225 ml of HNO₃ 1.0 M

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.