Ask Question
10 February, 15:14

You are given a 2.9237 g sample of a substance with the generic formula MCl2 (H2O) 6. After completely drying the sample (which means removing the 6 moles of H2O per mole of MCl2), the sample weighs 1.5941 g. What is the identity of element M? Write your answer as a chemical symbol.

+2
Answers (1)
  1. 10 February, 17:36
    0
    M is cobalt (Co)

    Explanation:

    Step 1: Data given

    Mass of MCl2 (H2O) 6 = 2.9237 grams

    After completely drying the sample (which means removing the 6 moles of H2O per mole of MCl2), the sample weighs 1.5941 g.

    Step 2: Calculate mass of water

    Mass of water = 2.9237 - 1.5941 = 1.3296 grams

    Step 3: Calculate moles water

    Moles water = mass water / molar mass water

    Moles water = 1.3296 grams / 18.02 g/mol

    Moles water = 0.07378 moles

    Step 4: Calculate moles of the whole substance

    For 1 mol MCl2 (H2O) 6 we have 6 moles H2O

    Number of moles of the whole substance = 0.07378 / 6 = 0.01230 moles

    Step 5: Calculate molar weight of the substance

    Molar weight = mass / moles

    Molar weight = 1.5941 grams / 0.01230 moles

    Molar weight = 129.6 g/mol

    Step 6: Calculate molar weight of M

    Molecular weight of M = 129.6 - (2*35.45)

    Molecular weight of M = 58.7 g/mol

    M is cobalt (Co)
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “You are given a 2.9237 g sample of a substance with the generic formula MCl2 (H2O) 6. After completely drying the sample (which means ...” in 📘 Chemistry if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers