Question

Diketahui : Galium = 2isotop.yaitu Ga-69 dan Ga-71 jika massa atom relatif (rata2) galium 69,8 Tent.kelimpahan dialam?#helpme

Answer 1

Dimisalkan :
Ga-69 = x%
Ga-71 = (100-x)%
ditanya: kelimpahan Galium
Ar = kelimpahan.no massa atom /100
69.8=(x.69)+{(100-x).71}/100
6980=69x+7100-71x
-120= -2x
60= x
jadi Ga - 69=60% dan Ga-71 = (100-60)%=40%