Boron has an atomic mass of 10.8 amu. it is known that naturally occurring boron is composed of two isotopes, boron-10 and boron-11. determine the percent of each isotope of boron

Boron -10 : 20%

Boron -11 : 80%

Explanation:

Mass of isotope  boron -10= 10

% abundance of isotope 1 = x% =

Mass of isotope boron-11 = 11

% abundance of isotope 2 = (100-x)% =

Formula used for average atomic mass of an element :

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

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them