How many grams of hydrogen are needed to produce 1.80g of water according to this equation?
2h2+o2 to 2h2o

0.2g of hydrogen is needed to produce 1.80g of water

Explanation:

No. of moles of water

From given values,

Weight of water

Molecular weight of water

No. of moles of water

From equation, it is clear that 2 moles of water can be formed by 2 moles of

Hence, 0.1 mole of water can be formed from 0.1 mole of

Now,

No. of moles of

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.