# 104_pre9 - Dr Little’s CLAB 104 Lab#9 Prelab Questions...

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Unformatted text preview: Dr. Little’s CLAB 104 Lab #9 Prelab Questions Name: 1. How many grams will 135 mL of ethanol weigh? (density of ethanol = 0.789 g/ml) X 2. What is the molar mass of salicylic acid (to 2 dec. places)? X 3. What is the molar mass of acetic anhydride (to 2 dec. places)? X 4. What is the molar mass of aspirin (to 2 dec. places)? X 8 Fe (1 mole = 55.8 g) +1 S8 (1 mole = 256.5 g) à 8 FeS (1 mole = 87.9 g) 5. How many moles of FeS can be made from 10.0 grams of Fe (show work)? X 6. How many moles of FeS can be made from 100.0 grams of S8 (show work)? X 7. How many moles of FeS can be made from 10.0 grams of Fe AND 100.0 grams of S8? X 8. How many grams of FeS can be made? (Convert your answer from #6 into grams of FeS) X 9. Why do you need to convert to moles? Why can’t you just compare grams of Fe and S8? 135 1.07E+02 D=m/V 1.38E+02 Formulas in manual 1.02E+02 Formulas in manual 1.80E+02 Formulas in manual 1.79E-01 Stoich Steps 3.12E+00 Stoich Steps 1.79E-01 Stoich Steps 1.58E+01 Try Again ...
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