This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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a) What observations are made during and after the reaction. • During heating, the white solid turns yellow and a colorless gas is produced. • After cooling, the yellow solid turns back to white. b) Give a balanced equation for the reaction. ZnCO_3(s) heat ZnO(s) + CO_2(g) c) Calculate the moles of CO_2 formed in the reaction. Step 1: Calculate the mass of CO_2 formed. The mass lost during heating is due to the formation of CO_2 gas. Mass of CO_2 = Initial mass of ZnCO_3 - Mass of residue (ZnO) Mass of CO_2 = 10g - 6.48g = 3.52g Step 2: Calculate the molar mass of CO_2. Molar mass of CO_2 = C + 2 × O = 12 + 2 × 16 = 44g/mol Step 3: Calculate the moles of CO_2. Moles of CO_2 = Mass of CO_2Molar mass of CO_2 = 3.52g44g/mol = 0.08mol The moles of CO_2 formed are 0.08 mol. d) If the residue was reacted with excess hydrochloric acid, calculate the mass of zinc chloride formed. Step 1: Write the balanced equation for the reaction of the residue (ZnO) with hydrochloric acid. ZnO(s) + 2HCl(aq) ZnCl_2(aq) + H_2O(l) Step 2: Calculate the molar mass of ZnO. Molar mass of ZnO = Zn + O = 65 + 16 = 81g/mol Step 3: Calculate the moles of ZnO in the residue. Moles of ZnO = Mass of ZnOMolar mass of ZnO = 6.48g81g/mol = 0.08mol Step 4: Determine the moles of ZnCl_2 formed. From the balanced equation, the mole ratio of ZnO to ZnCl_2 is 1:1. Therefore, Moles of ZnCl_2 = Moles of ZnO = 0.08mol. Step 5: Calculate the molar mass of ZnCl_2. Molar mass of ZnCl_2 = Zn + 2 × Cl = 65 + 2 × 35.5 = 65 + 71 = 136g/mol Step 6: Calculate the mass of ZnCl_2 formed. Mass of ZnCl_2 = Moles of ZnCl_2 × Molar mass of ZnCl_2 Mass of ZnCl_2 = 0.08mol × 136g/mol = 10.88g The mass of zinc chloride formed is 10.88 g. Send me the next one 📸