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10 February, 13:34

What is the mass, in grams, of 2.50 * 10-3 mol of aluminum sulfate?

a. 0.855 g

b. 123.04 g

c. 85.54 g

d. 342.14 g

e. 1368 g

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Answers (1)
  1. 10 February, 16:40
    0
    The mass is 0.855 grams (option A)

    Explanation:

    Step 1: Data given

    aluminium sulfate = Al2 (SO4) 3

    Numer of moles Al2 (SO4) 3 = 2.50 * 10^-3 moles

    atomic mass Al = 26.99 g/mol

    atomic mass S = 32.065 g/mol

    Atomic mass O = 16 g/mol

    Step 2: Calculate molar mass Al2 (SO4) 3

    Molar mass = 2 * 26.99 + 3*32.065 + 12*16

    Molar mas = 342.175 g/mol

    Step 3: Calculate mass Al2 (SO4) 3

    Mass Al2 (SO4) 3 = moles Al2 (SO4) 3 * molar mass Al2 (SO4) 3

    Mass Al2 (SO4) 3 = 2.5 * 10^-3 moles * 342.175 g/mol

    Mass Al2 (SO4) 3 = 0.855 grams

    The mass is 0.855 grams (option A)
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