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Question

Neon occurs as two isotopes of mass numbers 20 and 22. Its relative atomic mass is 20.2. What is the percentage of 20Ne in naturally occurring neon?


  1. 90

  2. 80

  3. 20

  4. 10


Solution

The correct option is A

90


Solution

We can use the formula:

Average atomic mass of Ne = [(Atomic mass of X1) x (% of X1)] + [(Atomic mass of X2) x (% of X2)]

                                                                                           100                                                     100

                                     20.2  = (20 x X ) + [22 x (100 - X)]

                                                         100                100

                                    2020  = 20X + 2200 - 22X

                                        2X  = 180

                                          X  = 90%

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