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2. Rubidium is a soft, silvery-white metal that has two common isotopes, 85 Rb and Rb. If the abundance is 72.17% of 85Rb (84.9118 amu) and 27.83% of 87Rb (86.9092 amu), what is the average atomic mass
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2. Rubidium is a soft, silvery-white metal that has two common isotopes, 85 Rb and Rb. If the

abundance is 72.17% of 85Rb (84.9118 amu) and 27.83% of 87Rb (86.9092 amu), what is the
average atomic mass of rubidium? Show your work to get credit.

User NateLillie
by
8.2k points

1 Answer

6 votes

Answer:

85

Step-by-step explanation:

  • average atomic mass =(72.17 x 85) (+27.83x87) all divide by 100
  • average atomic mass = 85

User Roywilliam
by
6.9k points
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