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.
ScanSolve AI Answer
Hey Dany, good to see you again. Here are the solutions to your chemistry questions: Part (a) Step 1: Calculate the number of moles of hydrochloric acid. The concentration of hydrochloric acid is 0.1 M and the volume is 23.8 cm^3. First, convert the volume from cm^3 to dm^3: Volume = 23.8 cm^31000 cm^3/dm^3 = 0.0238 dm^3 Now, calculate the moles using the formula: Moles = Concentration × Volume Moles of HCl = 0.1 mol/dm^3 × 0.0238 dm^3 = 0.00238 mol Moles of HCl = 2.38 × 10^-3 mol The student's handwritten calculation is correct. The number of moles of hydrochloric acid is 2.38 × 10^-3 mol. Step 2: Calculate the number of moles of MCO₃. The balanced chemical equation is: MCO_3(s) + 2HCl(aq) → MCl_2(aq) + CO_2(g) + H_2O(l) From the equation, the mole ratio of MCO₃ to HCl is 1:2. So, moles of MCO₃ = (1)/(2) × moles of HCl Moles of MCO_3 = (1)/(2) × 2.38 × 10^-3 mol = 1.19 × 10^-3 mol The number of moles of MCO₃ is 1.19 × 10^-3 mol. Step 3: Calculate the relative molecular mass of MCO₃. The mass of MCO₃ is 0.24 g and the moles of MCO₃ are 1.19 × 10^-3 mol. The relative molecular mass (M_r) is calculated as: M_r = MassMoles M_r of MCO_3 = 0.24 g1.19 × 10^-3 mol ≈ 201.68 g/mol Rounding to a reasonable number of significant figures (e.g., 3 sig figs based on 0.24 g): M_r of MCO_3 ≈ 202 The relative molecular mass of MCO₃ is 202. Step 4: Calculate the relative atomic mass of the metal M. The relative molecular mass of MCO₃ is 202. The atomic mass of Carbon (C) is 12.0. The atomic mass of Oxygen (O) is 16.0. In MCO₃, there is one M atom, one C atom, and three O atoms. M_r(MCO_3) = A_r(M) + A_r(C) + 3 × A_r(O) 202 = A_r(M) + 12.0 + 3 × 16.0 202 = A_r(M) + 12.0 + 48.0 202 = A_r(M) + 60.0 A_r(M) = 202 - 60.0 = 142.0 The relative atomic mass of the metal M is 142.0. Part (b) Step 5: Name the theory that is used to explain the shapes of simple covalent molecules and ions. The theory used to explain the shapes of simple covalent molecules and ions is the Valence Shell Electron Pair Repulsion (VSEPR) theory. This theory states that electron pairs around a central atom will arrange themselves as far apart as possible to minimize repulsion, thus determining the molecule's geometry. The theory is Valence Shell Electron Pair Repulsion (VSEPR) theory. Send me the next one 📸