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In this type of problem, the mass of one substance is given, usually in grams. From this, you are to determine the amount in moles of another substance that will either react with or be produced from the given substance.
Mass-mass calculations are the most practical of all mass-based stoichiometry problems. Moles cannot be measured directly, while the mass of any substance can generally be easily measured in the lab. The mass of the given substance is converted into moles by use of the molar mass of that substance from the periodic table. Then, the moles of the given substance are converted into moles of the unknown by using the mole ratio from the balanced chemical equation. Finally, the moles of the unknown are converted to mass by use of its molar mass.
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The calculations steps will be used when the reactants are given in moles and the products need to be displayed in grams (or mass).
The calculations steps will be used when the reactants are given in mass and the products need to be displayed in moles.
This video will show you one of the most common and powerful things a chemist can do: predict the mass of a product, given the reactant masses.
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