A newly discovered element, X, has two naturally occurring isotopes. 93.5 percent of the sample is an isotope with a mass of 268.9 u, and 6.5 percent of the sample is an isotope with a mass of 269.9 u. What is the weighted average atomic mass for this element?

268.5 u

269.0 u

269.4 u

269.8 u

Question

A newly discovered element, X, has two naturally occurring isotopes. 93.5 percent of the sample is an isotope with a mass of 268.9 u, and 6.5 percent of the sample is an isotope with a mass of 269.9 u. What is the weighted average atomic mass for this element?
 
268.5 u 

269.0 u 

269.4 u 

269.8 u

anonymous · Answer

This belongs in chemistry.....

anonymous · Answer

I dont know how to put it in Chemistry, im new to this website, i dont use it lot, only when i really need help. Can you help me please ? @bkeith2698

agent0smith · Answer

93.5*268.9 + 6.5*269.9 =  26896.5

divide it by 100 = 268.965