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# Stoichiometry part 2

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• 1. It’s really helpful, not just a way to make you cry.
• 2. What do the 4, 3 and the 2 as coefficients mean ??? A) They are MOLE ratios. B) They are GRAM ratios C) They are atom, molecule and FU ratios. D) They are liter ratios. E) All of the above. F) Only A and C G) Only A, C, and DThe coefficients of a balancedchemical equation are MOLEratios, atom-molecule-FU ratios, orLiter ratios. CHOICE G!
• 3. If you have 40 atoms of Fe and 90 molecules of O2 …. 20Then you can make _______________ FU’s of the product. ironWhat is the limiting reactant? _______________ 60How much of the reactant in excess is LEFT OVER? ______
• 4. If you have 12 atoms of Fe and 6 molecules ofoxygen then youcan make _______________ FU’s of ferricoxide.
• 5. If you have 400 atoms of Fe and 300 moleculesof oxygen then youcan make _______________ FU’s of ferricoxide. Weird problem – BOTH are the limiting reactant and you run out of both of them simultaneously !!
• 6. If you have 9 moles of Fe and 6 moles ofoxygen then youcan make _____________ MOLES of ferricoxide.
• 7. If you have 405 moles of Fe and 300 moles ofoxygen then youcan make _______________ moles of ferricoxide.
• 8. If you have 4 moles of EACH reactant.HOW MANY MOLES OF THE REACTANTINXS WILL BE LEFT OVER?
• 9. If you have 12 moles of Fe and 15 moles of oxygenhow much OXYGEN will be left over after thereaction is complete? __________And, how much product can youmake?__________
• 10. Get your calculator ready. SHOW WORK If you have 100 grams of iron and 100 grams of oxygen how much product can you make?100 g OX x 1 mole OX x 2 mole product x 160g product 1 32 grams OX 3 mole OX 1 mole product100 g Fe x 1 mole Fe x 2 mole product x 160g product 1 56 grams Fe 4 mole OX 1 mole product That emphasis means 142 is the answer !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
• 11. Now we know, from the last slide that if you have100 grams of each reactant only 142 grams ofproduct are made. Since iron was the limitingreactant, how much of our 100 grams of oxygen isUSED UP? ______________How much of the oxygen is LEFT OVER?_______________