Lithium-6 has a mass of 6.0151 amu and lithium-7 has a mass of 7.0160 amu. the relative abundance of li-6 is 7.42% and the relative abundance of li-7 is 92.58%. based on this data alone, calculate the average atomic mass for lithium to the correct number of significant digits.

The average atomic mass of Lithium is 6.94 amu.

Explanation:

Mass of isotope Li-6 = 6.0151 amu

% abundance of isotope  Li-6 = 7.42%=

Mass of isotope Li-7=  7.0160

% abundance of isotope Li-7 = 92.58% =

Formula used for average atomic mass of an element :

Therefore, the average atomic mass of Lithium is 6.94 amu.

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.