Nimo

Study smarter with Nimo

Personalised revision that adapts to you. Ace your revision with unlimited practice questions that are designed to help you learn faster. We're slowly rolling out to more and more students.

Try Nimo

Calculate theoretical mass from balanced equation

Quantitative chemistry • Yield and atom economy

Key concepts

What you'll likely be quizzed about

  • A balanced chemical equation shows how many moles of each substance react or are produced.
  • The coefficients in the equation indicate the direct mole ratios linking reactants and products.
  • Changes in one substance's amount affect another in proportion to these coefficients.
  • Accurate mole ratio usage enables correct conversion between moles of reactants and products.
  • Any errors in balancing or ignoring coefficients lead to incorrect theoretical mass results.

Flashcards

Test your knowledge with interactive flashcards

How should rounding be handled in stepwise calculations?

Click to reveal answer

Avoid premature rounding during intermediate steps and round only the final answer to maintain appropriate significant figures.

Key notes

Important points to keep in mind

Always balance the equation before starting calculations.

Convert given mass to moles using moles = mass ÷ Mr.

Use mole ratios from the balanced equation to convert moles of reactant to moles of product.

Convert moles of product to mass using mass = moles × Mr, maintaining units in grams.

Identify the limiting reagent when multiple reactant masses are provided.

Assume complete reaction for theoretical mass; actual yields will usually be lower.

Maintain consistent units: grams for mass, g mol-1 for molar mass.

Avoid rounding until the final answer; round to the correct significant figures.

Verify calculations by reversing from final mass to moles for consistency.

Ensure coefficients used in ratios originate from the balanced equation.

Built with v0