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

Entry Task: March 5 th -6 th Block #1. Entry Task Question: 2 Mg + O 2  2MgO How many grams of Mg are needed to produce 35 moles of MgO ? You have ~10 minutes. Agenda:. Discuss Label Reasoning ws 1 Stoich Notes #2 Grams  Grams HW: Mole Ratio Lab. Avervision answers. I can….

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

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  1. Entry Task: March 5th -6th Block #1 Entry Task Question: 2Mg + O2 2MgO How many grams of Mg are needed to produce 35 moles of MgO? You have ~10 minutes

  2. Agenda: • Discuss Label Reasoning ws 1 • Stoich Notes #2 GramsGrams • HW: Mole Ratio Lab

  3. Avervision answers

  4. I can… • Identify the quantitative relationship in a balanced chemical equation • Determine the mole ratios from a balanced chemical reaction • Use the sequence of steps used in solving stoichiometric problems

  5. Grams to Gram ratio Chromium metal reacts with oxygen gas to create chromium III oxide. ___Cr + ___O2 ___Cr2O3 4 3 2

  6. ___Cr + ___O2 ___Cr2O3 4 3 2 a. How many grams of Chromium III oxide were produced if 35.5 grams of oxygen gas were used? g of Cr2O3 35.5 grams O2 g of Cr2O3 What information from the question goes in letter A and explain why? What information from the question goes in letter H and explain why? What information from the question goes in letter G and explain why? 35.5 grams O2 it’s the information given _____g of Cr2O3, that it the end label- what we are looking for _____g of Cr2O3, it should match the end label

  7. ___Cr + ___O2 ___Cr2O3 4 3 2 a. How many grams of Chromium III oxide were produced if 35.5 grams of oxygen gas were used? g of Cr2O3 35.5 grams O2 1 mole of O2 g of Cr2O3 g of O2 1 mole of Cr2O3 What information from the question goes in letter F and explain why? What information from the question goes in letter B and explain why? What information from the question goes in letter C and explain why? 1 mole of Cr2O3 , it’s the mole to gram conversion _____grams of O2, it needs to be diagonal to the given. 1 mole of O2, it’s the mole gram conversion

  8. ___Cr + ___O2 ___Cr2O3 4 3 2 a. How many grams of Chromium III oxide were produced if 35.5 grams of oxygen gas were used? mole of Cr2O3 g of Cr2O3 35.5 grams O2 1 mole of O2 g of Cr2O3 g of O2 mole of O2 1 mole of Cr2O3 What information from the question goes in letter E and explain why? What information from the question goes in letter D and explain why? mole of Cr2O3 , it’s diagonal from 1 mole of Cr2O3 mole of O2, it’s diagonal from mole of O2

  9. NOW we plug in the numbers to find out our answer.

  10. ___Cr + ___O2 ___Cr2O3 4 3 2 a. How many grams of Chromium III oxide were produced if 35.5 grams of oxygen gas were used? 2 mole of Cr2O3 151.989 g of Cr2O3 35.5 grams O2 1 mole of O2 g of Cr2O3 31.998 g of O2 3 mole of O2 1 mole of Cr2O3 35.5 X 2 X 151.989 10791.2 112 g of Cr2O3 31.998 X 3 95.994

  11. ___Cr + ___O2 ___Cr2O3 4 3 2 a. How many grams of Chromium III oxide were produced if 0.25 grams of oxygen gas were used? 2 mole of Cr2O3 151.989 g of Cr2O3 0.25 grams O2 1 mole of O2 g of Cr2O3 31.998 g of O2 3 mole of O2 1 mole of Cr2O3 0.25 X 2 X 151.989 75.995 0.79 g of Cr2O3 31.998 X 3 95.994

  12. ___Cr + ___O2 ___Cr2O3 4 3 2 b. How many grams of chromium metal were used if 75.0 grams of chromium III oxide were produced? 75.0 grams Cr2O3 51.996 g of Cr 1 mole of Cr2O3 4 mole of Cr g of Cr 2 mole of Cr2O3 151.989 g of Cr2O3 1 mole of Cr 75.0 X 4 X 51.996 15598.8 51.3 g of Cr 151.989 X 2 303.978

  13. ___Cr + ___O2 ___Cr2O3 4 3 2 c. How many grams of oxygen gas were used if 50.0 grams of chromium III oxide were produced? 31.998 g of O2 50.0 g of Cr2O3 1 mole of Cr2O3 3 mole of O2 grams O2 2 mole of Cr2O3 151.989 g of Cr2O3 1 mole of O2 50.0 X 3 X 31.998 4799.7 15.8 g of O2 303.978 151.989 X 2

  14. ___Na + ___O2___Na2O 4 2 a. How many grams of sodium are needed to make 500 grams of sodium oxide? 500 g of Na2O 1 mole of Na2O 22.99 g of Na 4 mole of Na grams Na 2 mole of Na2O 61.979 g of Na2O 1 mole of Na 500 X 4 X 22.99 459.80 371 g of Na 123.958 61.979 X 2

  15. ___Na + ___O2___Na2O 4 2 b. How many grams of oxygen are needed to react with 40.0 grams of sodium to complete this reaction? 40.0 g of Na 1 mole of Na 31.99 g of O2 1 mole of O2 grams O2 4 mole of Na 22.99 of Na 1 mole of O2 40.0 X 1 X 31.99 1279.92 13.9 g of O2 91.96 22.99 X 4

  16. ___Na + ___O2___Na2O 4 2 c. If I had 300 grams of sodium how much sodium oxide can be made (assume there is an excess of oxygen gas) 300 g of Na 1 mole of Na 61.979 g of Na2O 2 mole of Na2O grams Na2O 4 mole of Na 22.99 g of Na 1 mole of Na2O 37187.4 300 X 2 X 61.99 404 g of Na2O 91.96 22.99 X 4

  17. ___Na + ___O2___Na2O 4 2 c. How many grams of sodium oxide will be produced if we had 75.0 grams of sodium oxide? 75.0 g of Na 1 mole of Na 61.979 g of Na2O 2 mole of Na2O grams Na2O 4 mole of Na 22.99 g of Na 1 mole of Na2O 9298.5 75.0 X 2 X 61.99 101 g of Na2O 91.96 22.99 X 4

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