U mean ur A is sodium thiosulfate Pentahydrate and when u calculate it's molar mass gave 82 but mine gives but 248;!!!

Mathematics

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Answer

248.20 g/mol\text{}248.20 \text{ g/mol}\text{}

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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 Na2S2O3⋅5H2O\text{Na}_2\text{S}_2\text{O}_3 \cdot 5\text{H}_2\text{O}.

We will use the following approximate atomic masses:

  • Sodium (Na): 22.99 g/mol22.99 \text{ g/mol}
  • Sulfur (S): 32.07 g/mol32.07 \text{ g/mol}
  • Oxygen (O): 16.00 g/mol16.00 \text{ g/mol}
  • Hydrogen (H): 1.008 g/mol1.008 \text{ g/mol}

  1. Calculate the molar mass of Na2S2O3\text{Na}_2\text{S}_2\text{O}_3.

    Molar mass of Na2S2O3=(2×22.99)+(2×32.07)+(3×16.00)\text{Molar mass of } \text{Na}_2\text{S}_2\text{O}_3 = (2 \times 22.99) + (2 \times 32.07) + (3 \times 16.00) =45.98+64.14+48.00= 45.98 + 64.14 + 48.00 =158.12 g/mol= 158.12 \text{ g/mol}

  2. Calculate the molar mass of one water molecule (H2O\text{H}_2\text{O}).

    Molar mass of H2O=(2×1.008)+(1×16.00)\text{Molar mass of } \text{H}_2\text{O} = (2 \times 1.008) + (1 \times 16.00) =2.016+16.00= 2.016 + 16.00 =18.016 g/mol= 18.016 \text{ g/mol}

  3. Calculate the molar mass of five water molecules (5H2O5\text{H}_2\text{O}).

    Molar mass of 5H2O=5×18.016 g/mol\text{Molar mass of } 5\text{H}_2\text{O} = 5 \times 18.016 \text{ g/mol} =90.08 g/mol= 90.08 \text{ g/mol}

  4. Add the molar mass of Na2S2O3\text{Na}_2\text{S}_2\text{O}_3 and 5H2O5\text{H}_2\text{O} to get the total molar mass of sodium thiosulfate pentahydrate.

    Total molar mass=158.12 g/mol+90.08 g/mol\text{Total molar mass} = 158.12 \text{ g/mol} + 90.08 \text{ g/mol} =248.20 g/mol= 248.20 \text{ g/mol}

    Therefore, the molar mass of sodium thiosulfate pentahydrate is approximately 248.20 g/mol248.20 \text{ g/mol}. Your calculation of 248 g/mol248 \text{ g/mol} is correct. The value of 82 g/mol82 \text{ g/mol} is incorrect for sodium thiosulfate pentahydrate.

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