50.0 grams each of potassium phosphate and strontium bromide are mixed into a solution whose total volume is 12.50 liters. 11. Write a balanced chemical equation for the reaction that occurs. 12. Which reactant is limiting and which is in excess? 13. How many grams of the excess reactant will be left over? 14. What is the final molarity of potassium bromide (assuming the volume does not change)?

Here is a graph of the molarity of hydrogen peroxide (H,0,) in a reaction vessel during a certain chemical reaction. Use this graph to answer the questions in the table below. 0.30- 0.269 0.25- 0.20- M 0,15- 0.10- 0.05 - 500 1000 1500 2000 2500 3000 seconds created x10 Is H,O, being created or destroyed by the chemical O destroyed reaction? neither created nor destroyed If H,O, is being created or destroyed, what is the rate at which it is being created or destroyed 700 seconds after the reaction starts? Round your answer to 2 significant digits. Also be sure your answer has the correct unit symbol. If H,O, is being created or destroyed, what is the average rate at which it is being created or destroyed during the first 700 seconds of the reaction? Round your answer to 2 significant digits. Also be sure your answer has the correct unit symbol.

A student weighs out 4.16 g of magnesium chloride and adds enough water to make 125.0 mL of solution.  The student then weighs out 8.82 g of sodium phosphate and adds enough water to make 250.0 mL of solution. 25.0 mL of the magnesium chloride solution is combined with 25.0 mL of the sodium phosphate solution. a.      Write a balanced equation for the reaction that occurs (remember to include phases). b.      If a precipitate forms, write the name of the precipitate and calculate the theoretical yield for the precipitate.  If no precipitate forms, calculate the limiting reactant. c.       If the temperature of the solution decreases, is this reaction exothermic or endothermic?

6. Sodium sulfide reacts with hydrochloric acid to produce hydrogen sulfide and sodium chloride. How many grams of sodium sulfide are required for complete reaction with 15.0 mL of 0.250 M hydrochloric acid? The molar mass of sodium sulfide is 78.046 g/mol. (Hint: start by writing the balanced equation for the reaction.)