Question

How many ammonia molecules are there in 0.50 ammonia moles? Overall, are these nitrogen and hydrogen atoms present?

Answer 1

One mole of any substance contains 6.02\times10^{23}\molecules (Avogadro's number). Therefore, in 0.50 moles of ammonia there are $0.50\times6.02\times10^{23}=3.01\times10^{23}$ molecules.

The second part of the question is not very clear. There are $3.01\times10^{23}$ molecules of NH₃ in given amount. One molecule of ammonia, in its turn, consists of one nitrogen and three hydrogen atoms, which is represented by the formula itself (NH₃).