Question

1. Calculate the number of pounds of CO2 released into the atmosphere when a 15.0-gallon tank of gasoline is burned in an automobile engine. Assume that gasoline is primarily octane, C8H18, and that the density of gasoline is 0.692 g·mL–1 (this assumption ignores additives). Also assume complete combustion.

2.The flask shown here contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.220 M NaOH.

a. What volume of NaOH is needed to reach the end point of the titration?

b. What volume of NaOH is needed to reach the end point of the titration?

3. Pure magnesium metal is often found as ribbons and can easily burn in the presence of oxygen. When 4.33 g of magnesium ribbon burns with 8.90 g of oxygen, a bright, white light and a white, powdery product are formed. Enter the balanced chemical equation for this reaction. Be sure to include all physical states.

a. Enter the balanced chemical equation for this reaction. Be sure to include all physical states

b. What is the limiting reactant?

c. The percent yield for the reaction is 90.3%, how many grams of product were recovered?

d. How many grams of the excess reactant remain?

Answer 1