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Unit 9 Review

Unit 9 Review. Question #1. Write the formula for the following compound: barium carbonate. BaCO 3. Question #2. How many moles of calcium are in 27.6 molecules of calcium?. 4.6 x 10 -23 moles. Question #3. How many formula units are in 89.6 moles of carbon?. 5.4 x 10 25 formula units.

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Unit 9 Review

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  1. Unit 9 Review

  2. Question #1 Write the formula for the following compound: barium carbonate BaCO3

  3. Question #2 How many moles of calcium are in 27.6 molecules of calcium? 4.6 x 10-23 moles

  4. Question #3 How many formula units are in 89.6 moles of carbon? 5.4 x 1025 formula units

  5. Question #4 What is the molar mass of aluminum chloride? AlCl3 133.4 g/moles

  6. Question #5 What is the molar mass HNO2? 47 g/moles

  7. Question #6 How many grams are in 9.06 moles of Li2SO4? 996.6 grams

  8. Question #7 How many liters are in 31 moles of bromide gas? 694.4 L

  9. Question #8 How many molecules are in 77 grams of BeI2? 1.76 x 1023 molecules

  10. Question #9 How many grams are in 33.4 atoms of nitrogen gas? 1.55 x 10-21 grams

  11. Question #10 Calculate the percent composition for EACH element in the compound NH3. % N = 82.6% % H = 17.4 %

  12. Question #11 Calculate the percent composition of magnesium MgO. 60.3 % Mg

  13. Question #12 Is the following compound an empirical or molecular formula? MgO EF

  14. Question #13 Is the following compound an empirical or molecular formula? C4H12 MF

  15. Question #14 Is the following compound an empirical or molecular formula? Al2O3 EF

  16. Question #15 What is the empirical formula when you have 40% of carbon and 60% hydrogen? CH18

  17. Question #16 What is the empirical formula when you have: 24% carbon 48% hydrogen 28% of oxygen CH27O

  18. Question #17 What is the molecular formula for the compound CClN with a molar mass of 184.5 g/mol? C3Cl3H3

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