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Stoichiometry is a powerful tool that all chemist must utilize. It separates the scientists from everyone else. It allows a chemist to determine an amount of another compound that is needed or produced in a chemical reaction.
Question- How many grams of water can be produced from
10.grams of H excess=you have more than enough O 1. You need a 2H (remember that the coefficients are really mole ratios) 2. FIND THE MOLES of your compound. Sometimes it is already given, sometimes you have to calculate it. Given==> 10. grams of H Find the moles=> 10.g H 3. DO THE RATIO-Now you can find the moles of any other compound in this reaction using the coefficients of the balanced reaction. Here are a few ways to do this. Factor Label
5.0 mol H or set up a proportion
x= 5.0 mol H or set up an equation proportion (remember that the coefficients are really mole ratios)
Now you solved for O 4. ANSWER THE QUESTION-Now find the mass from the number of moles 5.0 mol H
If I wanted to know about the O 2.5 mol O
Conclusion- Find the moles, do the ratio, answer the question On to Limiting Stoichiometry |