Which of the following quantities contains the greatest number of particles?

2 moles of carbon atoms

2 moles of carbon dioxide molecules

2 moles of diatomic oxygen molecules

all of these quantities contain the same number of particles.

All of these quantities contain the same number of particles

Explanation: according to Avogadro's law, equal volumes of all gases under the same conditions of temperature and pressure contain equal numbers of molecules. According to Avogadro's principle, the number of Particles present in one mole of any substance is equal to 6.02x10^23

Therefore, 2moles will contain 2 x 6.02x10^23 = 1.204x10^24. This will be the same for all the elements listed in the question.

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.