Relative Masses

Calculations to do with relative atomic mass, relative formula mass and relative molecular mass.

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  • Created by: Sophie
  • Created on: 04-10-09 20:07

1. Calculate the relative atomic mass, Ar, of the following elements from the isotopic abundances: Gallium containing 60% 69Ga and 40% 71Ga.

  • Gallium 68.9
  • Barium 92.4
  • Gallium 69.8
  • Gallium 62.3
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Other questions in this quiz

2. Use Ar values to calculate the Relative formula mass of Pb(NO3)2.

  • 229.6
  • 332.4
  • 331.2
  • 7

3. Calculate the relative atomic mass of silicon containing 92.18% 28Si, 4.71% 29Si and 3.11% 30Si.

  • Silicon 23.1
  • Silicon 34.2
  • Silicon 28.11
  • Iron 92.5

4. Use Ar values to calculate the relative formula mass of NH3

  • 2.0
  • 19.0
  • 17.0
  • 21.0

5. Is the relative formula mass of C6 H12 06, 180.0?

  • True
  • False

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