Stoichiometry: mole-to-mole and mass conversions
Strengthen your stoichiometry skills with mole-to-mole and mass conversion practice based on balanced chemical equations. Work through mixed-difficulty questions that build confidence with ratios, mol...
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Pick a difficulty and question count to begin.
About this quiz
What you’ll practice
This quiz targets the core stoichiometry workflow: start from a balanced equation, use mole ratios, and convert between moles and grams with molar mass.
Each question gives 4 options and there’s no timer, so you can focus on dimensional analysis and clean unit cancellation rather than speed.
Difficulty and question settings
Choose your question count before you start and set the difficulty to match your goals - quick review, steady skill-building, or a full mixed challenge.
Difficulty is balanced by mixing straightforward one-step conversions with multi-step problems that combine molar mass, coefficients, and unit tracking.
Common pitfalls to avoid
- Using an unbalanced equation (coefficients must be correct before ratios)
- Flipping the mole ratio (reactant/product coefficients in the wrong order)
- Mixing up grams and moles or skipping molar mass conversion
- Rounding too early and drifting from the best answer choice
- Forgetting units during setup (units should cancel to the target unit)
Tips for better accuracy
Write the given value with units, multiply by the mole ratio from the equation, then apply molar mass only when you must move between grams and moles. If your final unit isn’t what the question asks for, retrace the conversion chain and check each factor direction.
Sample questions
What is the molar mass of water (H2O)?
- A.18 g/mol
- B.16 g/mol
- C.20 g/mol
- D.22 g/mol
In the reaction 2H2 + O2 → 2H2O, how many moles of H2 are needed to produce 1 mole of H2O?
- A.2 moles
- B.1 mole
- C.0.5 moles
- D.4 moles
How many grams are in 2 moles of carbon dioxide (CO2)?
- A.88 g
- B.44 g
- C.22 g
- D.66 g
Quiz FAQ
How many questions are in this quiz?
This quiz has 120 questions on mole-to-mole and mass conversion stoichiometry.
What format are the questions in?
Every question is multiple-choice with 4 options, and there is no timer.
Can I choose the number of questions and difficulty?
Yes. You can select your preferred question count and set the difficulty (or keep it mixed) before starting.
Do I need to balance equations first?
Yes. Stoichiometric ratios come from coefficients in a balanced equation, so balancing is essential for correct conversions.
What’s the most common mistake in mass conversions?
Skipping the molar mass step or using the wrong molar mass for the substance. Always convert grams ↔ moles with the correct formula mass.
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