Limiting reagent and yield in the Haber process

You will write three small functions for the reaction of nitrogen with hydrogen. The first finds the limiting reagent, the second the moles of ammonia, and the third the percent yield.

The idea. The equation $\text{N}_{2}\ +\ 3\text{H}_{2}\ \rightarrow \ 2\text{NH}_{3}$ needs 3 mol of hydrogen for each mole of nitrogen. The reagent that runs out first sets the amount of ammonia.

Your tasks.

1. Complete limiting(n_n2, n_h2) so that it returns the text "N2" or "H2".
2. Complete ammonia_moles(n_n2, n_h2) so that it returns the moles of ammonia at completion.
3. Complete percent_yield(actual, n_n2, n_h2) so that it returns the percent yield.