Most students consume an appropriate amount of:. The USDA recommends 10-35% of calories come from this macronutrient, which is found in meat, milk, soy, and many other foods.

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oofoofoof1

19.04.2022

Health

Boron -10 : 20%

Boron -11 : 80%

Explanation:

Mass of isotope boron -10= 10

% abundance of isotope 1 = x% = $\frac{x}{100}$

Mass of isotope boron-11 = 11

% abundance of isotope 2 = (100-x)% = $\frac{100-x}{100}$

Formula used for average atomic mass of an element :

$\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})$

$10.8=\sum[(10)\times \frac{x}{100})+(11)\times \frac{100-x}{100}]]$

x=20

Therefore, percent of boron -10 is 20% and isotope boron-11 is (100-20)= 80%.

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