Question

How to find percentage of isotopes

Answer 1

Answer:

given an element U of relative atomic mass 10.8 for example with isotopes U-10 and U-11 we can get their percentages by the following steps.

Explanation:

1:let the Percentage of U-10 equal to X% and percentage of U-11equal to Y%.

2:The addition of X% and Y% equal to 100%.

3:X%=100%-Y%

4:X% of U-10 +Y% of U-11=10.8

5: substitute 3 in 4.

6: i.e (100-Y)% of U-10+Y% of U-11=10.8.

7:(100-Y)/100 of 10 +Y/100 of 11=10.8.

8:100-Y/10 +11Y=10.8.

9:(1000-10Y+11Y)/100=10.8.

10:1000+Y=10.8*100

11:1000+Y=1080.

12:Y=1080-1000.

13:Y=80.

14: from 3,X=100%-Y%.

X=100%-80%=20%.

15: Therefore, the percentage of isotopes in the isotopic mixture are 20% U-10 and 80% U-11.