Naturally occurring gallium consists of 60.108% Ga-69, with a mass of 68.9256 AMU, and 39.892% Ga-71, with a mass of 70.9247 AMU. The average atomic mass of gallium will be ____

Answer: 69 A.M.U
Explanation

Similarly, you could input the percentages normally and then divide by 100:

Mr(Ga)=(68.925660.108)+(70.924739.892)100

Mr(Ga)=69.7231 to 4 decimal places

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