Balance chemical reactions (and more...).A great tool for checking if you got your answer right! WolframAlpha will not show you step-by-step reasoning - but "Balancing equation" from Cavalcade o' Chemistry will help you with that. Use the link below to access WolframAlpha.

Start by clicking on the "=" (equals) sign

Once you entered your equation, the tool interprets it and provides the balanced equation.

Note: you get correct answers as far as the dataset is complete.