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Honolulu, Hawaii, United States
I have played for 25 years and coached for the last 17 years--certified United States Professional Tennis Association Professional One--worked for Punahou Schools-voted the #1 Sports School in the United States, as a Program Supervisor, in charge of coaching the High Performance Players as well as coordinating programs for K-12 and Tennis Pro Education.

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Sunday, January 18, 2009

Sample Exam Ep 6

review essay

Short Answer

1. For the reaction 2Na(s) + Cl (g) --> 2NaCl(s), how many grams of NaCl could be produced from 103.0 g of Na and 13.0 L of Cl (at STP)?

2. Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas are formed when 48.7 g of sodium are added to water?
2Na + 2H O --> 2NaOH + H


3. When a mixture of sulfur and metallic silver is heated, silver sulfide is produced. What mass of silver sulfide is produced from a mixture of 3.0 g Ag and 3.0 g S ?
16Ag(s) + S (s) --> 8Ag S(s)

4. What is the limiting reagent when 150.0 g of nitrogen react with 32.1 g of hydrogen?
N (g) + 3H (g) --> 2NH (g)

5. A 500-g sample of Al (SO ) is reacted with 450 g of Ca(OH) . A total of 596 g of CaSO is produced. What is the limiting reagent in this reaction, and how many moles of excess reagent are unreacted?
Al (SO ) (aq) + 3Ca(OH) (aq) --> 2Al(OH) (s) + 3CaSO (s)

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