the average atomic mass of a sample of an element x is 16.2u. what are the percentages of isotopes 5 under 16x and 8 under 18 x in the sample?
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16.2 = 16 × x/100 + 18 × (100-x)/100. Thus the percentage of X in the sample is 90℅. The percentage of the other isotope X in the sample will be 100-90 = 10%.Jul 11, 2017
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