Calculate the average atomic mass of unknown element X. You determine that isotope 127X makes up 80%, isotope 126X makes up 17%, and isotope 128X makes up 3%.
C.
a. 127.10 amu
b. 126.86 amu
127.54 amu
d. 126.20 amu

the correct answer is option d

explanation:

i was wrong its d because they dont use cm when calculating square roots

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.