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15 August, 21:38

Which of the following substances has a molar mass of 208g

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Answers (2)
  1. 15 August, 22:01
    0
    Missing question: P₂O₅, BaCl₂, AlCl₃, MgCl₂.

    Answer is: barium chloride (BaCl₂).

    a) M (P₂O₅) = 2 · Ar (P) + 5 · Ar (O) · g/mol.

    M (P₂O₅) = 2 · 31 + 5 · 16 · g/mol = 142 g/mol.

    b) M (BaCl₂) = Ar (Ba) + 2 · Ar (Cl) · g/mol.

    M (BaCl₂) = 137,3 + 2 · 35,45 · g/mol = 208,2 g/mol.

    c) M (AlCl₃) = Ar (Al) + 3 · Ar (Cl).

    M (AlCl₃) = 27 + 3 · 35,45 · g/mol = 133,35 g/mol.

    d) M (MgCl₂) = Ar (Mg) + 2 · Ar (Cl) · g/mol.

    M (MgCl₂) = 24,3 + 2 · 35,45 · g/mol = 95,2 g/mol.
  2. 15 August, 22:03
    0
    The list of substances is:

    a) P2O5

    b) BaCl2

    c) AlCl3

    d) MgCl2

    Answer:BaCl2

    Explanation:

    I will find the molar mass of each substance

    The molar mass is the sum of the masses of each atom in the unit formula.

    1) P2O5

    Molar mass = 2 * atomic mass of P + 5 * atomic mass of O = 2 * 31 g/mol + 5 * 16 g/mol = 62g/mol + 80g/mol = 140 g/mol.

    ∴ This is not the answer.

    2) BaCl2

    Molar mass = atomic mass of Ba + 2 * atomic mass of Cl = 137.3 g/mol + 2 * 35.5 g/mol = 208.3 g/mol ≈ 208 g/mol

    ∴ This is the answer

    3) AlCl3

    Molar mas = atomic mass of Al + 3 * atomic mass of Cl = 27 g/mol + 3 * 35.5 g/mol = 133.5 g/mol

    ∴ This is not the answer

    4) MgCl2

    molar mass = atomic mass of Mg + 2*atomic mass of Cl = 24.3 g/mol + 2*35.5 g/mol = 95.3 g/mol

    ∴ this is not the answer
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