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HW3

HW3. 58. What is the density of each of these gases at STP?. C 3 H 8 Ne NO 2. 58. What is the density of each of these gases at STP?. C 3 H 8 molar mass = 44 g Ne molar mass = 20.2 NO 2 molar mass = 46 g Molar volume is 22.4 L. 58. What is the density of each of these gases at STP?.

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HW3

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  1. HW3

  2. 58. What is the density of each of these gases at STP? • C3H8 • Ne • NO2

  3. 58. What is the density of each of these gases at STP? • C3H8 molar mass = 44 g • Ne molar mass = 20.2 • NO2 molar mass = 46 g Molar volume is 22.4 L

  4. 58. What is the density of each of these gases at STP? • C3H8 44g / 22.4L= 1.96 g/L • Ne 20.2g / 22.4L= .90 g/L • NO2 46g / 22.4L= 2.05 g/L

  5. 60. Calculate the percent composition of each compound • H2S • (NH4)2C2O4 • Mg(OH)2 • Na3PO4

  6. 60. Calculate the percent composition of each compound • H2S Molar mass is 34g Percent composition of an element is mass of that element divided by the molar mass of the compound X 100 % H is 2/34 X 100 = 6% % S is 32/34 X 100 = 94%

  7. 60. Calculate the percent composition of each compound B. (NH4)2C2O4 Molar mass = 124g %N is 28/124 X 100 = 22.6% %H is 8/124 X 100 = 6.5% % C is 24/124 X 100 = 19.3% % O is 64/124 X 100 = 51.6%

  8. 60. Calculate the percent composition of each compound C. Mg(OH)2 Molar mass = 58.3g %Mg is 24/58 X 100 = 41% %O is 32/58 X 100 = 55% %H is 2/58 X 100 =4%

  9. 60. Calculate the percent composition of each compound D. Na3PO4 Molar mass = 164 % Na is 69/164 X 100 = 42% % P is 31/164 X 100 = 19% % O is 64/164 X 100 = 39%

  10. 62. Which of the following compounds has the highest iron content? • FeCL2 • Fe(C2H3O2)3 • Fe(OH)2 • FeO

  11. 62. Which of the following compounds has the highest iron content? • FeCL2 • Fe(C2H3O2)3 • Fe(OH)2 • FeO What are the molar masses? What are the percent compositions of Fe in each?

  12. 62. Which of the following compounds has the highest iron content? • FeCL2 Molar mass = 127g %Fe + 56/127 X 100 = 44%

  13. 62. Which of the following compounds has the highest iron content? B. Fe(C2H3O2)3 Molar mass = 233g %Fe is 56/233 X 100 = 24%

  14. 62. Which of the following compounds has the highest iron content? C. Fe(OH)2 Molar mass = 90g %Fe is 56/90 X 100 = 62%

  15. 62. Which of the following compounds has the highest iron content? D. FeO Molar mass = 72g %Fe is 56/72 X 100 = 78%

  16. 64. Classify each formula as an empirical or a molecular formula • S2Cl2 • C6H10O4 • Na2SO3 • C5H10O5 • C17H19NO3 • (NH4)2CO3

  17. 64. Classify each formula as an empirical or a molecular formula • S2Cl2 M • C6H10O4 M • Na2SO3 E • C5H10O5 M • C17H19NO3 E • (NH4)2CO3 E

  18. 66. Determine the molecular formula for each compound • 94.1% O ; 5.9% H; molar mass = 34g • 40.0% C ; 6.6% H; 53.4% O; molar mass = 120g

  19. 66. Determine the molecular formula for each compound • 94.1% O ; 5.9% H; molar mass = 34g .94 X 34g = 32 g O .059 X 34g = 2 g H There are two moles of both H and O, so the molecular formula must be H2O2

  20. 66. Determine the molecular formula for each compound • 40.0% C ; 6.6% H; 53.4% O; molar mass = 120g .4 X 120 = 48 g C .066 X 120 = 7.92 g H .534 X 120 = 64 g O There are 4 moles of C, 8 moles of H, and 4 moles of O, so the formula must be C4H8O4

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