How Much? The Amount of Chemical Change · Paper 1 — Free Chemistry HL Practice Questions

In the Haber process, $\text{N}_2\text{(g)} + 3\text{H}_2\text{(g)} \rightarrow 2\text{NH}_3\text{(g)}$. A chemical engineer charges a closed reactor with $2.0\ \text{mol}$ of $\text{N}_2$ and $5.0\ \text{mol}$ of $\text{H}_2$. What is the maximum amount, in mol, of $\text{NH}_3$ that can be produced?

Complete combustion of ethene proceeds according to the equation: $$\text{C}_2\text{H}_4\text{(g)} + 3\text{O}_2\text{(g)} \rightarrow 2\text{CO}_2\text{(g)} + 2\text{H}_2\text{O(l)}$$ A $0.50\ \text{mol}$ sample of ethene undergoes complete combustion in excess oxygen. Which of the following gives the amount, in mol, of $\text{CO}_2$ produced and the amount, in mol, of $\text{O}_2$ consumed? A — $0.50$ — $1.0$ B — $1.0$ — $1.5$ C — $1.0$ — $1.5$ D — $1.0$ — $1.5$ (Replacing table format with standard options below)

In the reaction $2\text{NaOH(aq)} + \text{H}_2\text{SO}_4\text{(aq)} \rightarrow \text{Na}_2\text{SO}_4\text{(aq)} + 2\text{H}_2\text{O(l)}$, a student mixes $0.40\ \text{mol}$ of NaOH with $0.25\ \text{mol}$ of $\text{H}_2\text{SO}_4$. Which reactant is limiting, and what amount, in mol, of $\text{Na}_2\text{SO}_4$ is produced?

A student dissolves $4.00\ \text{g}$ of NaOH(s) in distilled water and makes the solution up to $250.0\ \text{cm}^3$ in a volumetric flask. A $25.0\ \text{cm}^3$ aliquot is titrated against hydrochloric acid of unknown concentration; the endpoint is reached after adding $22.5\ \text{cm}^3$ of HCl(aq). What is the concentration of the hydrochloric acid, in $\text{mol dm}^{-3}$?