A comprehensive beginner-to-advanced progression of stoichiometry questions: mole concept, Avogadro’s constant, molar mass, balancing equations, mole ratios, limiting reagent, theoretical vs actual yield, concentrations/dilutions, precipitation reactions, simple titrations, and empirical/molecular formulas.
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src="https://entermedschool.org/embed/questions#{"title":"Stoichiometry: From Moles to Reactions","questions":[{"prompt":"Which statement best defines 1 mole of a substance?","options":[{"label":"A","body":"The mass of 1 gram of the substance","isCorrect":false},{"label":"B","body":"Exactly 6.02 × 10^23 particles (atoms, molecules, or formula units) of that substance","isCorrect":true},{"label":"C","body":"The number of protons in the nucleus","isCorrect":false},{"label":"D","body":"The volume of 22.4 L of any substance","isCorrect":false},{"label":"E","body":"The number of neutrons in carbon-12","isCorrect":false}],"explanation":"A mole is defined as a fixed number of entities: 6.02 × 10^23. It is not defined by 1 gram, and 22.4 L applies only to 1 mole of an ideal gas at STP."},{"prompt":"Avogadro’s constant is most directly used to convert between:","options":[{"label":"A","body":"Mass (g) and volume (L)","isCorrect":false},{"label":"B","body":"Moles and number of particles","isCorrect":true},{"label":"C","body":"Temperature (°C) and pressure (atm)","isCorrect":false},{"label":"D","body":"Electrons and neutrons","isCorrect":false},{"label":"E","body":"Density and molarity","isCorrect":false}],"explanation":"Avogadro’s constant (≈ 6.02 × 10^23 mol⁻¹) converts moles ↔ number of particles. Mass conversions need molar mass, not Avogadro’s constant alone."},{"prompt":"How many molecules are in 0.50 mol of CO2?","options":[{"label":"A","body":"3.01 × 10^22","isCorrect":false},{"label":"B","body":"3.01 × 10^23","isCorrect":true},{"label":"C","body":"6.02 × 10^23","isCorrect":false},{"label":"D","body":"1.20 × 10^24","isCorrect":false},{"label":"E","body":"0.50 molecules","isCorrect":false}],"explanation":"Number of molecules = moles × Avogadro’s constant = 0.50 × 6.02 × 10^23 = 3.01 × 10^23 molecules."},{"prompt":"How many moles of water are in 18.0 g of H2O? (Mr(H2O) = 18.0)","options":[{"label":"A","body":"0.10 mol","isCorrect":false},{"label":"B","body":"0.50 mol","isCorrect":false},{"label":"C","body":"1.00 mol","isCorrect":true},{"label":"D","body":"2.00 mol","isCorrect":false},{"label":"E","body":"18.0 mol","isCorrect":false}],"explanation":"Moles = mass ÷ molar mass = 18.0 g ÷ 18.0 g/mol = 1.00 mol."},{"prompt":"What is the mass of 0.250 mol of NaCl? (Mr(NaCl) = 58.5)","options":[{"label":"A","body":"7.31 g","isCorrect":false},{"label":"B","body":"14.6 g","isCorrect":true},{"label":"C","body":"29.3 g","isCorrect":false},{"label":"D","body":"58.5 g","isCorrect":false},{"label":"E","body":"0.250 g","isCorrect":false}],"explanation":"Mass = moles × molar mass = 0.250 × 58.5 = 14.6 g (to 3 s.f.)."},{"prompt":"A student says: “Mr(CO2) = 44, so the molar mass of CO2 is 44 g/mol.” Which statement is correct?","options":[{"label":"A","body":"The student is correct: molar mass in g/mol has the same number as Mr","isCorrect":true},{"label":"B","body":"The molar mass is 44 kg/mol, not g/mol","isCorrect":false},{"label":"C","body":"The molar mass is 44 g, not per mole","isCorrect":false},{"label":"D","body":"Mr cannot be used to get molar mass","isCorrect":false},{"label":"E","body":"The molar mass depends on temperature, so it cannot be determined","isCorrect":false}],"explanation":"Relative molecular/formula mass (Mr) is a ratio with no units. The molar mass has units g/mol and numerically matches Mr (e.g., Mr = 44 → 44 g/mol)."},{"prompt":"How many moles are in 2.0 × 10^24 atoms of helium? (NA = 6.02 × 10^23 mol−1)","options":[{"label":"A","body":"0.332 mol","isCorrect":false},{"label":"B","body":"3.32 mol","isCorrect":true},{"label":"C","body":"6.02 mol","isCorrect":false},{"label":"D","body":"12.0 mol","isCorrect":false},{"label":"E","body":"1.20 mol","isCorrect":false}],"explanation":"Moles = particles ÷ NA = (2.0 × 10^24) ÷ (6.02 × 10^23) ≈ 3.32 mol."},{"prompt":"How many moles of chloride ions (Cl−) are present in 0.10 mol of CaCl2 (assuming complete dissociation)?","options":[{"label":"A","body":"0.05 mol","isCorrect":false},{"label":"B","body":"0.10 mol","isCorrect":false},{"label":"C","body":"0.20 mol","isCorrect":true},{"label":"D","body":"0.30 mol","isCorrect":false},{"label":"E","body":"0.40 mol","isCorrect":false}],"explanation":"Each formula unit of CaCl2 contains 2 chloride ions. So 0.10 mol CaCl2 contains 2 × 0.10 = 0.20 mol Cl−."},{"prompt":"Which sample contains the greatest number of atoms?","options":[{"label":"A","body":"1.0 mol He","isCorrect":false},{"label":"B","body":"1.0 mol O2","isCorrect":false},{"label":"C","body":"1.0 mol CO2","isCorrect":false},{"label":"D","body":"1.0 mol CH4","isCorrect":true},{"label":"E","body":"2.0 mol H2","isCorrect":false}],"explanation":"Count moles of atoms: He = 1 mol atoms; O2 = 2 mol atoms; CO2 = 3 mol atoms; CH4 = 5 mol atoms; 2 mol H2 = 4 mol atoms. CH4 has the most atoms."},{"prompt":"At the same temperature and pressure, which pair contains the same number of molecules?","options":[{"label":"A","body":"1.0 L He(g) and 1.0 L N2(g)","isCorrect":true},{"label":"B","body":"1.0 L He(g) and 2.0 L He(g)","isCorrect":false},{"label":"C","body":"1.0 L O2(g) and 1.0 L CO2(g), but only because both contain oxygen","isCorrect":false},{"label":"D","body":"2.0 L H2(g) and 1.0 L H2(g)","isCorrect":false},{"label":"E","body":"1.0 L He(g) and 1.0 L liquid water","isCorrect":false}],"explanation":"Avogadro’s law: equal volumes of gases at the same T and P contain equal numbers of molecules, regardless of gas identity. The key is equal volume and both being gases."},{"prompt":"Which chemical equation is correctly balanced?","options":[{"label":"A","body":"H2 + O2 → H2O","isCorrect":false},{"label":"B","body":"2H2 + O2 → 2H2O","isCorrect":true},{"label":"C","body":"N2 + H2 → NH3","isCorrect":false},{"label":"D","body":"2Na + Cl2 → NaCl","isCorrect":false},{"label":"E","body":"C3H8 + O2 → CO2 + H2O","isCorrect":false}],"explanation":"A balanced equation has the same number of each atom on both sides. Only 2H2 + O2 → 2H2O balances H and O atoms correctly."},{"prompt":"In the balanced equation 2H2 + O2 → 2H2O, which interpretation is correct?","options":[{"label":"A","body":"2 g of H2 reacts with 1 g of O2 to form 2 g of H2O","isCorrect":false},{"label":"B","body":"2 moles of H2 react with 1 mole of O2 to form 2 moles of H2O","isCorrect":true},{"label":"C","body":"2 molecules of H2 react with 2 molecules of O2 to form 1 molecule of H2O","isCorrect":false},{"label":"D","body":"The coefficients represent volumes of liquids, not gases or moles","isCorrect":false},{"label":"E","body":"The coefficients must always be the same for all substances","isCorrect":false}],"explanation":"Coefficients in a balanced equation represent ratios of particles and (most commonly used) ratios of moles. They are not mass ratios."},{"prompt":"If you multiply every coefficient in a balanced equation by 2, what changes?","options":[{"label":"A","body":"The equation becomes unbalanced","isCorrect":false},{"label":"B","body":"The mole ratios change","isCorrect":false},{"label":"C","body":"The equation still represents the same reaction; only the amounts are scaled up","isCorrect":true},{"label":"D","body":"The substances in the reaction change","isCorrect":false},{"label":"E","body":"The reaction becomes faster automatically","isCorrect":false}],"explanation":"Scaling all coefficients keeps ratios the same, so the chemistry is unchanged. You’re just describing a larger (or smaller) amount of the same reaction."},{"prompt":"What is the coefficient of O2 when propane combusts completely? (C3H8 + O2 → CO2 + H2O)","options":[{"label":"A","body":"3","isCorrect":false},{"label":"B","body":"4","isCorrect":false},{"label":"C","body":"5","isCorrect":true},{"label":"D","body":"8","isCorrect":false},{"label":"E","body":"10","isCorrect":false}],"explanation":"Balanced equation: C3H8 + 5O2 → 3CO2 + 4H2O. Oxygen atoms: 10 on each side."},{"prompt":"For the reaction N2 + 3H2 → 2NH3, how many moles of NH3 can be produced from 6.0 mol of H2 (with excess N2)?","options":[{"label":"A","body":"2.0 mol","isCorrect":false},{"label":"B","body":"3.0 mol","isCorrect":false},{"label":"C","body":"4.0 mol","isCorrect":true},{"label":"D","body":"6.0 mol","isCorrect":false},{"label":"E","body":"12.0 mol","isCorrect":false}],"explanation":"Mole ratio NH3:H2 = 2:3. So 6.0 mol H2 produces 6.0 × (2/3) = 4.0 mol NH3."},{"prompt":"In the reaction Fe2O3 + 3CO → 2Fe + 3CO2, how many moles of CO are required to react with 0.50 mol Fe2O3?","options":[{"label":"A","body":"0.50 mol","isCorrect":false},{"label":"B","body":"1.0 mol","isCorrect":false},{"label":"C","body":"1.5 mol","isCorrect":true},{"label":"D","body":"2.0 mol","isCorrect":false},{"label":"E","body":"3.0 mol","isCorrect":false}],"explanation":"The ratio CO:Fe2O3 is 3:1. So CO needed = 0.50 × 3 = 1.5 mol."},{"prompt":"Which balanced equation correctly represents the formation of aluminum oxide from aluminum and oxygen?","options":[{"label":"A","body":"Al + O2 → AlO2","isCorrect":false},{"label":"B","body":"2Al + O2 → 2AlO","isCorrect":false},{"label":"C","body":"4Al + 3O2 → 2Al2O3","isCorrect":true},{"label":"D","body":"Al2 + O3 → Al2O3","isCorrect":false},{"label":"E","body":"2Al + 3O2 → Al2O3","isCorrect":false}],"explanation":"Al2O3 contains 2 Al and 3 O atoms. The balanced formation equation is 4Al + 3O2 → 2Al2O3."},{"prompt":"Why must chemical equations be balanced before doing stoichiometry calculations?","options":[{"label":"A","body":"Because balancing makes the reaction faster","isCorrect":false},{"label":"B","body":"Because balancing changes the substances into safer forms","isCorrect":false},{"label":"C","body":"Because balanced coefficients give the correct mole ratios and conserve atoms","isCorrect":true},{"label":"D","body":"Because balanced equations always have smaller numbers","isCorrect":false},{"label":"E","body":"Because unbalanced equations violate the octet rule","isCorrect":false}],"explanation":"Stoichiometry relies on mole ratios from coefficients. Balancing ensures the same number of each atom on both sides (conservation of matter)."},{"prompt":"Calcium carbonate decomposes: CaCO3 → CaO + CO2. If 2.0 mol of CaCO3 decomposes completely, how many moles of CO2 form?","options":[{"label":"A","body":"1.0 mol","isCorrect":false},{"label":"B","body":"2.0 mol","isCorrect":true},{"label":"C","body":"3.0 mol","isCorrect":false},{"label":"D","body":"4.0 mol","isCorrect":false},{"label":"E","body":"0.50 mol","isCorrect":false}],"explanation":"The equation shows a 1:1 ratio between CaCO3 and CO2, so 2.0 mol CaCO3 produces 2.0 mol CO2."},{"prompt":"For 2Na + Cl2 → 2NaCl, you have 3.0 mol Na and 1.0 mol Cl2. What is the maximum amount of NaCl that can form?","options":[{"label":"A","body":"1.0 mol","isCorrect":false},{"label":"B","body":"2.0 mol","isCorrect":true},{"label":"C","body":"3.0 mol","isCorrect":false},{"label":"D","body":"4.0 mol","isCorrect":false},{"label":"E","body":"6.0 mol","isCorrect":false}],"explanation":"1.0 mol Cl2 requires 2.0 mol Na and produces 2.0 mol NaCl. Since Na is in excess, Cl2 limits the product to 2.0 mol NaCl."}]}"
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