Consider the following balanced reaction between hydrogen and nitrogen to form ammonia:

3H2(g)+N2(g)→2NH3(g)

How many moles of NH3 can be produced from 21.0 mol of H2 and excess N2?

14 moles of NH3 can be produced from 21.0 mol of H2 and excess N2.

Explanation:

Balanced equation for the production of ammonia is given as:

3H2(g)+N2(g)→2NH3(g)

Given that:

number of moles of H2 = 21 moles

moles of NH3 produced from 21 moles of H2 =?

In the above equation the limiting reagent is hydrogen gas so the production of ammonia directly depends on it.

From the chemical equation we can see that:

3 moles of H2 react to form 2 moles of NH3

so, 21 moles of  H2 will react to form x moles of NH3

=

=

= 14 MOLES

from the calculation by applying stoichiometry it is found that 14 moles of ammonia is produced by using 21 moles of hydrogen.

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.