- Stoichiometry 3 A When Nahco3 Is Heated Above 270 C It Decomposes To Form Sodium Carbonate Water And Carbon Dioxid 1 (25.69 KiB) Viewed 26 times
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) 2NaHCO --> Na2CO3 + H2O +CO2 (a) Calculate the mass of Na₂CO3 produced from the decomposition of 30.0g of NaHCO3. (5 points)
4. A student reacts methane gas (CH₂) 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 (Na-AIF) from the following reaction: 6HF, + 3NaAlO(→ Na AIF + 3H₂O + Al₂O3(s) (g) 2(s) 6(s) 2 (a) What mass of HF(g) is required to make 185g of Na3AlF? (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)
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, is produced when 3.0g of sodium reacts with 5.0g of oxygen gas? (8 points) (c) How much of the excess reagent is left after the reaction is 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 SO3? (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 + 2NaNO3