Limiting Reagent — Prelims Questions

Consider the reaction: $2\text{H}_2(g) + \text{O}_2(g) \rightarrow 2\text{H}_2\text{O}(l)$. If $4,\text{g}$ of $ext{H}_2$ reacts with $32,\text{g}$ of $ext{O}_2$, which is the limiting reagent?

In the reaction $2\text{Al}(s) + 3\text{Cl}_2(g) \rightarrow 2\text{AlCl}_3(s)$, if $54,\text{g}$ of $ext{Al}$ reacts with $106.5,\text{g}$ of $ext{Cl}_2$, what is the theoretical yield of $ext{AlCl}_3$?

When $10,\text{L}$ of $ext{H}_2$ gas reacts with $5,\text{L}$ of $ext{N}_2$ gas at STP to form ammonia ($ext{NH}_3$), what volume of $ext{NH}_3$ is produced? (Assume complete reaction)

Which of the following statements about a limiting reagent is INCORRECT?

$20,\text{g}$ of $ext{CaCO}_3$ is reacted with $20,\text{g}$ of $ext{HCl}$. The reaction is: $ext{CaCO}_3(s) + 2\text{HCl}(aq) \rightarrow \text{CaCl}_2(aq) + \text{H}_2\text{O}(l) + \text{CO}_2(g)$. What is the mass of $ext{CO}_2$ produced?

If $100,\text{mL}$ of $0.1,\text{M},\text{AgNO}_3$ solution is mixed with $50,\text{mL}$ of $0.2,\text{M},\text{NaCl}$ solution, what is the limiting reagent in the precipitation reaction?

Consider the combustion of methane: $ext{CH}_4(g) + 2\text{O}_2(g) \rightarrow \text{CO}_2(g) + 2\text{H}_2\text{O}(l)$. If $16,\text{g}$ of $ext{CH}_4$ is reacted with $48,\text{g}$ of $ext{O}_2$, what mass of $ext{H}_2\text{O}$ is produced?