This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.
ScanSolve AI Answer
I have not named any solution "A" as sodium thiosulfate pentahydrate. I only mentioned sodium thiosulfate pentahydrate as a reactant in the context of your experiment. Let's calculate the molar mass of sodium thiosulfate pentahydrate, which has the chemical formula Na_2S_2O_3 · 5H_2O. We will use the following approximate atomic masses: Sodium (Na): 22.99 g/mol Sulfur (S): 32.07 g/mol Oxygen (O): 16.00 g/mol Hydrogen (H): 1.008 g/mol Step 1: Calculate the molar mass of Na_2S_2O_3. Molar mass of Na_2S_2O_3 = (2 × 22.99) + (2 × 32.07) + (3 × 16.00) = 45.98 + 64.14 + 48.00 = 158.12 g/mol Step 2: Calculate the molar mass of one water molecule (H_2O). Molar mass of H_2O = (2 × 1.008) + (1 × 16.00) = 2.016 + 16.00 = 18.016 g/mol Step 3: Calculate the molar mass of five water molecules (5H_2O). Molar mass of 5H_2O = 5 × 18.016 g/mol = 90.08 g/mol Step 4: Add the molar mass of Na_2S_2O_3 and 5H_2O to get the total molar mass of sodium thiosulfate pentahydrate. Total molar mass = 158.12 g/mol + 90.08 g/mol = 248.20 g/mol Therefore, the molar mass of sodium thiosulfate pentahydrate is approximately 248.20 g/mol. Your calculation of 248 g/mol is correct. The value of 82 g/mol is incorrect for sodium thiosulfate pentahydrate. The final answer is 248.20 g/mol