Question

1. Elemental sulfur occurs as octatomic molecules, S8. What mass (g) of fluorine gas is needed to react completely with 17.8 g of sulfur to form sulfur hexafluoride?

2. (Challenging): Solid iodine trichloride is prepared in two steps: first, a reaction between solid iodine and gaseous chlorine to form solid iodine monochloride; second, treatment of the solid with more chlorine gas. (a) Write a balanced equation for each step. (b) How many grams of iodine are needed to prepare 2.45 kg of final product, assuming 100% yield for each step? (c) How many grams of iodine are needed to prepare 2.45 kg of final product, assuming 80% yield for each step?

3. Complete the following table for the reaction of salicylic acid (C₇H₆O₃) with acetic anhydride [(CH₃CO)₂O] to form aspirin, C₉H₈O₄ and acetic acid (CH₃COOH). The density of acetic anhydride is 1.080 g/mL. Hint: you will need to find the limiting reactant. Indicate the excess remaining of the reactant that is not limiting.

C₇H₆O₃(s) + (CH₃CO)₂O(l) → C₉H₈O₄(s) + CH₃COOH(l)

	C7H6O3(s)	(CH3CO)2O(l)	C9H8O4(s)	CH3COOH(l)
initial	3.077 g	5.50 mL	N/A	N/A
reacts
final

4. How many grams of iron(III) sulfide form when 62.0 mL of 0.135 M iron(III) chloride reacts with 45.0 mL of 0.285 M calcium sulfide?

5. What mass of precipitate forms when 185.5 mL of 0.533 M NaOH is added to 627 mL of a solution that contains 15.8 g of aluminum sulfate per liter?

6. (Challenging): An individual's blood alcohol (C₂H₅OH) level can be determined by titrating a sample of blood plasma with a potassium dichromate solution. The balanced equation is below. If 35.46 mL of 0.05961 M Cr₂O₇^2- is required to react completely with 28.00 g of plasma, what is the mass percent of alcohol in the blood plasma?

Balanced equation: 16H⁺(aq) + 2Cr₂O₇^2-(aq) + C₂H₅OH(aq) → 4Cr³⁺(aq) + 2CO₂(g) + 11H₂O(l)

Rubric

intro WS rubric

intro WS rubric

Criteria Ratings Pts This criterion is linked to a Learning OutcomeDescription of criterion 5.0 pts Full Marks Student shows complete work for all questions in the worksheet. Student work is legible. 2.5 pts 50-99% Student shows complete work for more than half of the questions. 0.0 pts < 50% Student shows complete work for less than half of the questions. Student work may be illegible.

Answer 1

Answer 2

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