Determining the number of grams required by a reactant to produce a set number of grams of the product.

Oxygen gas can be prepared in a Laboratory by the reaction:

2KClO3(s) => 2KCl(s) + 3O2(g)

How many grams of KClO3 must be reacted to produce100g of O2?

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...u'll need to start with 100g of O2. You'll need the molecular weights of all the elements in this reaction:

O: 16.0g
K: 39.1g
Cl: 35.5g

Therefore how many moles of ...