Chemistry

Question

How many moles are found in a 100.0 g sample of CuF2?

2 Answer

  • You can solve this by dividing the mass by the molar mass. The molar mass of CuF2 is about 101.5 g/mol. Therefore there are 100.0/101.5 = 0.985 mol.
  • The molar mass is calculated by the sum of the mass numbers of the atoms that form the molecule. For example: CuF2
    Cu: 1*63,54u = 63,54u 
    F: 2*19u = 38u
    Thus, the molar mass of CuF2 is: 63,54+38= 101,54 g/ mol.
    And the number of mol is calculated by the mass divided by the molar mass or it can be solving through the rule of 3. For example:

    100 g de CuF2
    101,54 g → 1 mol
    100 g  → x

    101,54x = 100
    x = 100/101,54
    x = 0,98483... → [tex]\boxed{x \approx 0,985 mol}[/tex]

    I hope I have helped you, good studies!
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