**POGIL-Stoichiometry How do chemists use balanced chemical equations? got bit D 23 mosquitoes? 10 He got…**

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## Question “POGIL-Stoichiometry How do chemists use balanced chemical equations? got bit D 23 mosquitoes? 10 He got…”

POGIL-Stoichiometry How do chemists use balanced chemical equations? got bit D 23 mosquitoes? 10 He got Mol-aria Why? Chemists use balanced chemical equations as a basis to calculate how much reactant is needed or product is formed in a reaction. This is called Stoichiometry- (stoi-key-ah-meh-tree) Another way of looking at it is using the mole ratio from the balanced equation and information about one compound in the reaction to determine information about another compound in the equation. A mole ratio is a conversion factor derived from the coefficients of a balanced chemical equation interpreted in terms of moles. In chemical calculations, mole ratios are used to convert between moles one thing and moles of another. Purpose: In this activity we will address the question: How do I convert between different chemical species in a given reaction? MODEL 1: Mole-to-Mole Stoichiometry (1-step) Example: mole-to-mole Question: Given the following equation: wod be 1N2 (g)+3 H2 (g) 2 NH, (g) How many moles of H2 are necded to produce 34.8 moles of NH,? Mole ratio Mole ratio Answer: 34.8 mol NH3 x 3 mol H 52,2mol H2 2 mol NHy 34.8 mol NH3 mol H2 52.2mol H 2 mol NH3 OR Key Questions: 1. What was the given in the example above? 3 molH come from? 2. Where did the 2 molNH Double check to see if 52.2 moles of H2 is the correct answer. SHOW the math below. 3.

Period: Date: Name: You Try… 4. Given the following chemical equation 4P+50,2 POs How many moles of P,O, are formed from 3.4 moles of O,7? SHOW the math below (a) (b) How many moles of P are needed to react with 30.1 moles of O2? SHOW the math below 5. Aluminum reacts with copper(II) chloride to make aluminum chloride and copper (a) Write the balanced equation Given 6 moles of CuCl, how many moles of AICI, were made? SHOW the math below (b) If 4.5 moles of AICI, were made, how many moles of CuCl, were used? SHOW the math below (c) Methane (CH) and sulfur (S,) react to produce carbon disulfide and hydrogen sulfide, a liquid often used in 6. the production of cellophane (a) Write the balanced equation (b) Calculate the moles of CS, produced when 1.50 mol of S, are used. SHOW the math below (c) How many moles of H,S are produced? SHOW the math below 7. Summarize model 1 in 2-3 sentences: STOP Mo

Period: Date: MODEL 2: Mole Mass Stoichiometry (2-step) Example: Starting with the mole Question: Given the following equation: Molar Mass H 1 N; (g)+3 H, (g) How many grams of H, are needed to produce 34.8 moles of NH,? 2 NH, (g) (2×1.01 g/mol)-2.02 g/mol Mole ratio Molar Mass Answer 2.02 g Ha 1 mol H 34.8 mol NH 3 mol H 2 mol NH 105 g H2 Key Questions: 8. What was the given in the example above? 3 molH 2 molNH 9. Where did the come from? 10. Where did the. 20 g come from? 1 molH 11. Look at the periodic table, how much does one mole of a Hydrogen atom weigh? Why is the molar mass of hydrogen (H2) 2.02 g/mol in the example 1 above? 12. Double check to see if 105 g H2 is the correct answer. SHOW the math below. You Try… 13. Given the following chemical equation 4 P+502 2 P,O (a) What is the molar mass of P,0,? (use your periodic table). SHOW the math below (b) How many grams of P Os are formed from 3.4 moles of O2? SHOW the math below

Period: Date: 14. Acetylene gas (CH) and calcium hydroxide are produced by adding water to calcium carbide(Cac) (a) Write the balanced equation Name (b) What is the molar mass of acetylene, CH,? show your math below. (c) How many grams of acetylene, CH2, are produced by adding 3 moles of CaC,? show your math below. (d) What is the molar mass of CaC,? show your math below. (e) How many grams of CaC, are needed to react completely with 490.0 moles H,0? show your math below. Example: starting with the mass Question: Given the following equation: Molar Mass NHy 1 N2 (g)+3 H2 (g) How many moles of H2 are needed to produce 34.8 grams of NH,? 2 NH3 (g) 14.01 g/mol+ 3×1.01 g/mol) 17.04 g/mol Molar Mass Mole ratio Answer: 34.8 g NHs 1 mol NH 17.04 g NH 3 mol Ha 3.06 mol H 2 mol NH Key Questions: 15. What was the given in the example above? 16. Look at the periodic table, how much does Hydrogen weigh? Nitrogen weigh? 17. Where did the molNH 17 g NH come from? 3 molH 18. Where did the, come from? 2 mol NH 19. Double check to see if 3.06 mol H2 is the correct answer. SHOW the math below. 20. Given the

Date: Period: ou Try… 20. Given the following chemical equation M 4 P+50 2 P-O (a) What is the molar mass of O2? show your math below. (b) How many moles of P,O, are formed from 3.4 grams of O,? SHOW the math below 21. Titanium is a transition metal used in many alloys because it is extremely strong and light weight. Titanium tetrachloride is extracted from titanium(IV) oxide, using chlorine and coke (carbon). Carbon dioxide is also released. (a) Write the balanced equation (b) Calculate the molar mass of TIO, show your math below. (c) How many moles of Cl, gas are needed to react with 1.25 grams of TIO,? show your math below. (d) How many moles of C are needed to react with 1.25 grams of TiO,? show your math below. 22. Summarize model 2 in 3-4 sentences. STOP

Date: Name: MODEL 3: Mass+ Mass Stoichiometry (3-step) Molar Mass H Example (2×1.01 g/mol) 2.02 /m Question: Given the following equation: 2 NH3 (g) 1 N, ()+3 H2 (g) How many grams of H are necded to produce 34.8 grams of NHy? Molar Mass NH 14.01 g/mol+(3×1.01 g/mol) 17.04 g/mol Molar Mass Mole ratio Molar Mass Answer: 2.02g Ha= 6.19 g H 1 mol H 34.8 g NH 1 mol NHa 17.04 g NHs 3 mol Ha 2 mol NH Key Questions: 23. What was the given in the example above? 24. What are the 3-steps to solving the mass-to-mass problem above? (Note: these are always the same threes steps!) 3 molH 2 molNH, 25. Where did the come from? 2.0 gH 26. Where did the, 1 motN come from? 1 mol NH 27. Where did the come from? 17 g NH 28. Double check to see if 6.19 g H2 is the correct answer. SHOW the math below. ou Try.. 29. Gi

Date: Period: You Try… 29. Given the following chemical equation 4 P+502 2 P,Os (a) What is the molar mass of P,O5? (use your periodic table)-show your math below. (b) What is the molar mass of 02? (use your periodic table)- show your math below. (c) How many grams of P,O, are formed from 3.4 grams of O2? SHOW the math below 30. Use the following balanced equation: 1B,0, 3 Mg > 3 MgO 2 B + (a) Calculate the molar mass of B,O (b) How many grams of B can be obtained from 234 grams of B,O,? (c) How many grams of magnesium are required to produce 40.0 grams of boron? 31. One the reactions used to inflate automobile air bags involves sodium azide (NaN,): NaN3 N2 Na + Balance and determine (calculate) the mass of N2, produced from the decomposition of 100.0 g NaN3. SHOW ALL WORK including how you get the molar masses.

Model 4: Volume 22.4 L of that gas 1 mole of any gas at STP* STP standard temperature and pressure, or 0’C and 1 atmosphere Example Molar Mass NH 14.01 g/mol (x1.01 g/mol) 17.04 g/mol Question: Given the following equation: 2 NH, () 1 N (g)+3 H2 (g) How many L of N, are needed to produce 38.2 g of NH,? Molar Volume Mole Ratio Molar Mass 22.4L N 25.1 L N 1 mol N 38.2g NH 1 mol NH 17.04 g NH 1 mol N 2 mol NH 32. What was the given in the example equation above? 22.4 LN 1 molN 33. Where did the ,come from? 34. Where did the Imol N 2 mol NH, come from? 1 mol NMome from? 35. Where did the 17 g NH 36. Double check to see if 25.1 L N; is the correct answer. SHOW the math below. 37. Given the following equation, how many L of H; gas are produced from 3.5 g HCl at STP? Ca+2HC CaCl+ H 38. Look at the purpose of the POGIL on the front page and answer the question. isuao s a juaqunn 8 asni noA sasur

Date: Period: Conversion Factors You just learned four conversion factors during this POGIL (Molar Mass, Mole Ratio, Molar Volume, and Avagadro’s Number). Match each of these with the questions below, describing how to determine the value or writing the value if it is constant. Include units. 39. What conversion factor is used to convert between atoms/formula units/molecules and moles? What is the value of this conversion factor? 40. What conversion factor is used to convert between mass and moles? How can this be calculated? 41. What is the only conversion factor that can be used to convert between two substances in a reaction? This is used to convert between moles of one substance to moles of another substance. How can this be determined? 42. What conversion factor is used to convert between moles and volume when at STP? What is the value of this conversion factor?

## Answer

| N2(g) + 3H2 19 2NH2 (9) . This is an example of a Haber Process for the Synthesis Ammonia from Hydrogen and Nitrogen. 3 mol H2 Tomes based on the following calculation: 2 I mol H3 = 3 moles H2 1 2 moles NH3 Now for 834.8 mols of Nutty 2 moles NH3 = 58.2 Moles of H2 (c), 14P + 502-> 2205 0. Arronding back to balanced Reaction 5 moles a gives – 3 moles a gives 5 moles hos a moles pros 5 moles Oz 2 moles mol off 5 mol, mol

Ros forms moles at 1:36. For 5 moles or more, the number of moles required to form moles is 4 for I mole. Fox 30.1 moles are needed for Qr i.l.u = p will. Moles of Allla Foormed = 2 for 1 Mole of Gillz = 2 moles Of Alles – for 6 Moles of Bulla = 2 xo Moles of Alla From = u moles Of Alleg – will Form

I mole of All too Number of moles Culla Regarred = 3-3 moles of lille 1. Required for 4.5 moles in Alles – X9.5 = 6.75 Moles of Culla. – Reputable Maximum I have Miq Four questions can be answered. You can answer 5 questions for convenience. Thanks for asking question

### Answer 2

Carbon disulfide (CH4) and sulfur(S8) react to make hydrogen sulfide and carbon disulfide. This liquid is often used in

Cellophane production

## Conclusion

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