if you have a balanced equation and already know the grams of one substance but need to find the grams another substance. How do you do that?

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You will need to multiply by three conversion factors...

Start with the mass of the given and

1. multiply by (1 mol given) / (molar mass of the given)

2. multiply by molar ratio of the needed to the given (mol needed / mol given) **Use the coefficients from the balanced equation**

3. multiply by (molar mass of the needed) / (1 mol needed)