Coefficients in balanced equations tell us the number of moles reacted or produced. They can also be used as conversion factors. This brings us to the golden rule of mole to mole conversion, what you need over what you have.
How many moles of Calcium Phosphide are required to produce 2.3 mol of pure Calcium
2Ca3P2 -> 6Ca + P4
2.3 mol x 6/2 = 3 mol of Calcium Phosphoide
When 0.7 mol of Scandium react with Chromium (III) Fluoride how many mole of Chromium should be produced?
Sc + CrF3 = Cr + ScF3
0.7 mol x 1/1 = 0.7 mol. Of Chromium
For more explanation on mole to mole conversions check this video out!
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