1 / 18

Entry Task: Feb 5 th -6 th Block #1

Entry Task: Feb 5 th -6 th Block #1. Write the Question How many formula units are in 50.0 grams of Iron II oxide? You have 5 minutes!. Agenda:. Discuss Particles <-> Moles<-> Grams Self Check on Concepts Discuss Self-Check Notes on Percent Composition HW: Percent Composition ws.

ginny
Télécharger la présentation

Entry Task: Feb 5 th -6 th Block #1

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Entry Task: Feb 5th-6thBlock #1 Write the Question How many formula units are in 50.0 grams of Iron II oxide? You have 5 minutes!

  2. Agenda: Discuss Particles <-> Moles<-> Grams Self Check on Concepts Discuss Self-Check Notes on Percent Composition HW: Percent Composition ws

  3. I can… • Calculate particles moles  grams • Explain what is meant by the percent composition of a compound.

  4. Discuss Particles  Moles  Grams Avervision for answers

  5. Clear off your Desk!! Calculators Periodic Tables Needed

  6. Discuss Self Check Avervision for answers

  7. Percent Composition is the percent of each element in a compound. Percent composition is a step in determining the ratio in elements in a compound/molecule.

  8. Example: Magnesium oxide- MgO By just looking at this compound, It LOOKS like it 50/50 of magnesium oxide. But according to its molar mass, it is not 50/50. Its molar mass is 24.305 g for Mg + 15.999 g for O, = 40.304 g 24.305g (Magnesium mass) 40.304 grams (mass of MgO) Magnesium = 0.60 X 100 = 60% Oxygen 15.999 g (oxygen mass) 40.304 grams (mass of MgO) = 0.40 X 100 = 40%

  9. Iron III oxide Fe2O3 Fe = 55.845 x 2 = 111.69 g  159.687 g 0.6994 X 100 = 69.9%  159.687 g O = 15.999x 3 = 47.997g 0.3005 X 100 = 30.1% 159.687 g

  10. Barium hydroxide Ba(OH)2 Ba= 137.33 g X 1 = 137.33 g  171.3438 g = 0.801 X 100 = 80.1% O= 15.999 g X 2 = 31.998 g  171.3438 g = 0.187 X 100 = 18.7% H= 1.0079 g X 2 = 2.0158 g  171.3438 g = 0.0117 X 100 = 1.2% 171.3438 g

  11. Lead (II) nitrate Pb(NO3)2 Pb= 207.2 g X 1 = 207.2 g  331.208 g = 0.626 x100 = 62.6% N= 14.007 g X 2 = 28.014 g  331.208 g = 0.0845 x100 = 8.46%  331.208 g = 0.289 x100 = 28.9% O= 15.999 g X 6 = 95.994 g 331.208 g

  12. Ammonium sulfate (NH4)2SO4  131.044 X 100 = 21.4 % N= 14.007 g X 2 = 28.014 g H= 1.0079 g X 8 = 8.06 g  131.044 X 100 = 6.2% S= 30.974 g X 1 = 30.974 g  131.044 X 100 = 23.6 % O= 15.999 g X 4 = 63.996 g  131.044 X 100 = 48.8.4 % add up % = 100% 1 mole = 131.044 grams

  13. Hydronium nitride (H3O)3N  71.1 grams x 100= H= 1.0079 g X 9 = 9.071 g = 12.7 % O= 15.999 g X 3 = 47.997 g  71.1 grams x 100= = 67.6 % N= 14.007 g X 1 = 14.007 g  71.1 grams x 100= = 19.7 % 71.1 grams

  14. Aluminum cyanide Al(CN)3 Al= 26.98 g X 1 = 26.98 g  105 grams x 100= = 25.6 %  105 grams x 100= = 34.3 % C= 12.0107 g X 3 = 36.032 g  105 grams x 100= = 40.0 % N= 14.007 g X 3 = 42.021 g 105 grams

More Related