Whether you multiply or add moles depends on the specific context and what you are trying to calculate. Here are some guidelines:
1. Multiplying Moles: You multiply moles when you are calculating the amount of a substance in a chemical reaction. For example, if you have the balanced equation 2H₂ + O₂ → 2H₂O, and you want to find out how many moles of water (H₂O) will be produced when a certain number of moles of hydrogen (H₂) react with oxygen (O₂), you would use the stoichiometry of the reaction to multiply the number of moles of hydrogen by the appropriate ratio.
2. Adding Moles: You add moles when you are combining the amounts of different substances. For example, if you have 3 moles of hydrogen gas (H₂) and 2 moles of oxygen gas (O₂), and you want to find out how many moles of gas you have in total, you would simply add the number of moles of hydrogen and oxygen together.
In summary, you multiply moles when dealing with chemical reactions and stoichiometry, and you add moles when combining the amounts of different substances.
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