Medium Practice — Set 1

Quick Recap — Stoichiometry & Concentration

• Molarity: $M=\dfrac{\text{moles of solute}}{\text{volume of solution (L)}}$.
• Molality: $m=\dfrac{\text{moles of solute}}{\text{mass of solvent (kg)}}$.
• Mole fraction: $x_A=\dfrac{n_A}{n_A+n_B}$.
• Limiting reagent: the reactant that runs out first (compare mole ratios to the equation).
• % yield $=\dfrac{\text{actual}}{\text{theoretical}}\times100$; dilution: $M_1V_1=M_2V_2$.