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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You're on a roll — Here are the answers to your questions: a) i) Determine the empirical formula of the oxide of iron. Step 1: Calculate the mass of iron (Fe). Mass of iron = (Mass of empty dish + residue) - Mass of empty dish Mass of iron = 12.66 g - 10.98 g = 1.68 g Step 2: Calculate the mass of the oxide of iron. Mass of oxide = (Mass of empty dish + oxide of iron) - Mass of empty dish Mass of oxide = 13.30 g - 10.98 g = 2.32 g Step 3: Calculate the mass of oxygen (O). Mass of oxygen = Mass of oxide - Mass of iron Mass of oxygen = 2.32 g - 1.68 g = 0.64 g Step 4: Convert masses to moles. Moles of Fe = Mass of FeMolar mass of Fe = 1.68 g56.0 g/mol = 0.03 mol Moles of O = Mass of OMolar mass of O = 0.64 g16.0 g/mol = 0.04 mol Step 5: Find the simplest mole ratio. Divide by the smallest number of moles (0.03 mol): Ratio of Fe = (0.03)/(0.03) = 1 Ratio of O = (0.04)/(0.03) ≈ 1.333 To get whole numbers, multiply by 3: Fe ratio = 1 × 3 = 3 O ratio = 1.333 × 3 = 4 Step 6: Write the empirical formula. The empirical formula is Fe_3O_4. ii) Write an equation for the reaction which took place in the combustion tube. The reaction is the formation of iron(II,III) oxide from iron and oxygen. 3Fe(s) + 2O_2(g) → Fe_3O_4(s) b) Corrosive is a destructive process in which iron is converted into hydrated iron (III) oxide. i) Two conditions necessary for rusting to occur: • Oxygen (or air) • Water (or moisture) ii) Two methods used to protect iron from rusting other than painting: • Galvanizing (coating iron with a layer of zinc) • Oiling/Greasing (applying a layer of oil or grease to prevent contact with air and water) c) Explain why it is not advisable to wash vehicles using seawater. Seawater contains dissolved salts, which act as electrolytes. These electrolytes increase the electrical conductivity of the water, thereby accelerating the rate of rusting (corrosion) of the metal parts of the vehicle. Send me the next one 📸