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Sit in groups of 4, hopefully with NEW PEOPLE

Sit in groups of 4, hopefully with NEW PEOPLE. You may have paper, pen, calculators, and a white board with markers and erasers. Stash your stuff somewhere out back. Your report card grades are now in the computer.

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Sit in groups of 4, hopefully with NEW PEOPLE

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  1. Sit in groups of 4, hopefully with NEW PEOPLE You may have paper, pen, calculators, and a white board with markers and erasers. Stash your stuff somewhere out back.

  2. Your report card grades are now in the computer. Today is the last day to appeal any mistakes. THE LAST DAY IS TODAY AT 3:00 PM! Please see me outside of class, not during today’s review. Tomorrow we celebrate in class (finally) Moles and Percent Composition by Mass

  3. Write the formulas for these 4 compounds. Write their empirical formulas next to them. Pentacontane C50H102 Dodecene C12H24 Pentene C5H10 Ethane C2H6

  4. Write these 4 compounds names and formulas. Write their empirical formulas next to them too. Pentacontane C50H102 Dodecene C12H24 Pentene C5H10 Ethane C2H6 C25H51 CH2 CH2 CH3

  5. You find an old silver coin with mass of 143.70 grams. What is the number of silver atoms (assume it is PURE silver).

  6. You find an old silver coin with mass of 143.70 grams. What is the number of silver atoms (assume it is PURE silver). • 1 mole Ag108 g Ag 143.70 g Ag1 X = 1.3306 moles Ag • 6.02 x 1023 atoms Ag1 mole Ag • 1.3306 moles Ag1 • X = 1.3306 x 6.02 x 1023 atoms = 8.0099 x 1023 atoms Ag 5 SF

  7. You dump 23.4 pounds of “chlorine”, into your pool. Being well educated, you know that pool chlorine is really sodium hypochlorite, an ionic compound, half of which is found on TABLE E!!! How many pounds of that stuff is really chlorine? Go to 3 SF

  8. You dump 23.4 pounds of “chlorine”, into your pool. Being well educated, you know that pool chlorine is really sodium hypochlorite, an ionic compound, half of which is found on TABLE E!!! How many pounds of that stuff is really chlorine? NaClO Na 1 x 23 g = 23 g Cl 1 x 35 g = 35 g O 1 x 16 g = 16 g 35 g74 g Cl X 100% = 47 % 23.4 p x 0.47 = 11.0 pounds! 74 g/mole

  9. You have 0.805 moles of niobium (V) hydroxide solid. How many grams is that?

  10. You have 0.805 moles of niobium (V) hydroxide solid. How many grams is that? Nb(OH)5 Nb 1 x 93 g = 93 g O 5 x 16 g = 80 g H 5 x 1 g = 5g 178 g/ mole 178 g1 mole 0.805 moles1 X = 143 g with 3 SF

  11. You make a dish of trail mix. Your recipe calls for .75 pounds chocolate, .50 pounds salty pretzels, .25 pounds salt free pretzels, .25 pounds raisins, and .50 pounds almonds. What is the percent composition by mass of chocolate in the mix? What is the percent composition by mass of almonds in this mix?

  12. You make a dish of trail mix. Your recipe calls for .75 pounds chocolate, .50 pounds salty pretzels, .25 pounds salt free pretzels, .25 pounds raisins, and .50 pounds almonds. What is the percent composition by mass of both chocolate and of almonds in this mix? 0.75 Pounds2.25 Pounds X 100% = 33% chocolate CHOC: • 0.50 Pounds2.25 Pounds • X 100% = 22% almonds Almonds:

  13. What is the molar mass of osmium (IV) phosphate?

  14. What is the molar mass of osmium (IV) phosphate? Os3(PO4)4 Os 3 x 190 g = 570 g P 4 x 31 g = 124 g O 16 x 16 g = 256 g 950 g/mole

  15. If I were you I would study some naming compound drills, and I would study my mole island map and especially using my units in the conversions. Study, read, get psyched!

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