Calculate the atomic mass of element x if there are two isotopes of this element (x-24 and x-28) and 75% of all x atoms are x-28 isotopes? 52 amu 26 amu 4 amu 27 amu

27 amu

Explanation:

If X-28= 75%

Then X-24 = 100-75= 25%

Then

(28 × 0.75) + (24× 0.25) = 21 + 6= 27 amu

NB

The sum of all the relative abundances of isotopes must be 100%.

The sum of the products of isotope abundance and mass for each isotope gives the relative atomic mass for the element

answer: cellular respiration takes in food and uses it to create atp, a chemical which the cell uses for energy. usually, this process uses oxygen, and is called aerobic respiration. it has four stages known as glycolysis, link reaction, the krebs cycle, and the electron transport chain.