4E —Atomic Structure & Decay

In the reaction $N_2+3H_{2}ightarrow2N{H}_3$, with $4$ mol $N_2$ and $9$ mol $H_2$, which reagent is limiting and why?

$H_2$; its coefficient-adjusted amount is smaller.

Raw amount vs limiting reagent: how do you tell which reactant is actually limiting?

Do not use raw moles or grams; divide by stoichiometric coefficient first.

If a reaction theoretically yields $6.0$ mol $N{H}_3$ but actually gives $4.8$ mol, what is the percent yield?

$80\%$; $4.8/6.0\times 100$.

What does percent yield measure in a reaction?

Actual product relative to theoretical maximum, times $100$.