Moles to Grams

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# Moles to Grams - PowerPoint PPT Presentation

Moles to Grams. problem gives moles but the answer must be in grams Calculate moles just like mole to mole calculations Use flow chart to change moles to grams (x MM). How many grams of aluminum are needed to fully react with three moles of O 2 ? 4Al + 3O 2  2Al 2 O 3.

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Presentation Transcript
Moles to Grams
• problem gives moles but the answer must be in grams
• Calculate moles just like mole to mole calculations
• Use flow chart to change moles to grams (x MM)
How many grams of aluminum are needed to fully react with three moles of O2?

4Al + 3O2 2Al2O3

If you are given moles but the answer must be in grams, you have a mole to mass problem.

Calculate moles just like mole to mole calculations

Use flow chart to change moles to grams (x MM)

How many grams of aluminum are needed to fully react with three moles of O2?

? mol 3 mol

4Al + 3O2 2Al2O3

3x =12

x = 4 mol Al

4 x 27 = 108 g Al

How many grams of O2 would be needed to fully react with 12 moles of aluminum?

12 mol ? mol

4Al + 3O2 2Al2O3

4x =12 (3)

4x = 36

x = 9 mol of O2

9 x (16x2) = 288 g of O2