- Chm 111 Name Balancing Chemical Equations 1 Balance The Following Chemical Equations 3 Points Each Cac H O C Hb 1 (32.77 KiB) Viewed 41 times
c. Sodium hydroxide reacts with copper (II) nitrate to form copper (II) hydroxide and sodium nitrate. Stoichiometry 3. (a) When NaHCO3 is heated above 270°C, it decomposes to form sodium carbonate, water, and carbon dioxide. Write a balanced equation for the decomposition reaction of NaHCO3. (2 points) (a) Calculate the mass of Na₂CO3 produced from the decomposition of 30.0g of NaHCO3. (5 points) 4. A student reacts methane gas (CH4) with oxygen gas (O₂). (a) Write a balanced chemical equation for the reaction. (2 points) (b) Calculate the theoretical yield of H₂O if 8.0g of CH4 reacts with excess oxygen gas. (5 points) (c) What is the percent yield? (2 points) 5. The manufacture of aluminum includes the production of cryolite (NasAIFe) from the following reaction: 6HF) + 3NaAlO2(s)→ Na3AlF6(s) + 3H₂O(1) + Al₂O3(s) (a) What mass of HF(g) is required to make 185g of Na3AlF6? (5 points)
(b) How many liters of HF(g) are needed to produce 36.0g of Al2O3? The density of HF (g) at 25 °C is 1.15g/L. (5 points) Limiting Reagents 6. Potassium superoxide, KO₂, reacts with carbon dioxide to form potassium carbonate and oxygen. This reaction makes potassium superoxide useful in a self-contained breathing apparatus. 4KO2(s) + 2CO2(g) → 2K₂CO3(s) + 302(g) (a) What mass of O₂ is produced from the reaction of 6.00g of KO₂ with 7.00g of CO₂? (8 points) (b) What mass of the excess reagent is left after the reaction? (5 points) 7. Sodium metal reacts with oxygen gas to produce the compound sodium oxide. (a) Write a balanced equation for the reaction. (2 points) (b) How much product, in grams, gas? (8 points) produced when 3.0g of sodium reacts with 5.0g of oxygen
(c) How much of the excess reagent is left after the reaction complete? (5 points) 8. Sulfur trioxide dissolves in water to make sulfuric acid, H₂SO4. (a) Write a balanced chemical equation for the reaction. (2 points) (b) Calculate the mass of sulfuric acid that could be produced from the reaction of 10.0 mL of water (d=1.00g/mL) and 20.0 g of SO,? (8 points) Solution Stoichiometry 9. What mass of Cu(OH)2 is produced from the reaction of 50.0mL of 3.00MNaOH with excess Cu(NO3)2? (6 points) Cu(NO3)2 + 2NaOH Cu(OH)2 + 2NaNO 10. What volume of 1.50M Ca(OH)2 is needed to react with 25.0mL of 2.0M HCI solution? (6 points)
Ca(OH)2 + 2HCI → 2H₂O +CaCl