Can somebody help me. Will mark brainliest.

Average atomic mass of X= 64.25 amu

Explanation:

Abundance of X-64 = 80%

Abundance of X-65 = 15%

Abundance of X-66 = 5%

Average atomic mass = ?

Solution:  

Average atomic mass of X = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  + (abundance of 3rd isotope × its atomic mass)  / 100

Average atomic mass of X= (80×64)+(15×65) +(5×66) /100

Average atomic mass of X =  5120 + 975 + 330 / 100

Average atomic mass of X  = 6425/ 100

Average atomic mass of X= 64.25 amu.

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.