An atom has the following three isotopes: 24 amu (percent abundance = 78.99%)25 amu (percent abundance =10.00\%) , and 26 amu (p ercent bundance=11.01\%) . Calculate the average atomic mass. What is the identity of this atom based on your calculation?
2 answers:
We multiply each mass with its percentage. 24*(78.99/100) = 18.96 25*(10/100)= 2.5 26*(11.01/100)= 2.86 Then add these together. 18.96+2.5+2.86= 24.32amu An element that has an average mass of nearly 24.32amu would be Mg (magnesium)
The average atomic mass is 24.31. The element is likely Magnesium. Work: 24(0.7899) = 18.95 25(0.1000) = 2.5 26(0.1101) = 2.86 18.95 + 2.5 + 2.86 = 24.31
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Moles Ca(NO3)2 = 100 x 0.250 / 1000 = 0.025
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