Element x has two isotopes. the table gives information about these isotopes. x-63: has an atomic mass of 62.9296 amu and an abundance of 69.15% x-64: has an atomic mass of 64.9278 amu and an abundance of 30.85% the average atomic mass of element x is amu.

Answer : The average atomic mass of an element X is, 63.546 amu

Solution : Given,

Mass of isotope X-63 = 62.9296 amu

% abundance of isotope X-63 = 69.15% = 0.6915

Mass of isotope X-64 = 64.9278 amu

% abundance of isotope X-64 = 30.85% = 0.3085

Formula used for average atomic mass of an element X :

Therefore, the average atomic mass of an element X is, 63.546 amu

The idea is to sum up the product of atomic mass and abundance for each of the isotope- e.g. 62.9296 and 69.15% for X-63- to find the average of isotope atomic mass weighted regarding their abundance, which is by definition the relative atomic mass of the element.

the answer is a. co2, this would be colder than the : )

explanation:

dynamic equilibrium is the answer.