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Balance a reaction by counting atoms

Review a balanced equation and a check of the atom counts on both sides.

Example view

A silent prepared walkthrough. The interactive view offers the same example controls.

Steps follow the video. Select a step to jump to it.

Step 1 of 5

In this walkthrough

Read the reaction

The sample asks for whole-number coefficients while keeping each chemical formula unchanged.

Continue in the real tool when you’re ready.

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Reaction-balancing example

Balance H2 + O2 → H2O using the smallest positive whole-number coefficients. Show the hydrogen and oxygen atom counts on each side before and after balancing. Change coefficients only, not the formulas.

The complete walkthrough

  1. Preserve the chemical formulas

    Open Solver and review the reaction. The example explicitly keeps the formulas unchanged.

  2. Request the worked solution

    Choose Work through problem to see the coefficients and the reasoning behind them.

  3. Count the atoms

    Check each element on both sides and verify that the coefficients are the smallest positive whole numbers.