Mr(CnH2n+1Br)=14n+81
w(Br)=0,6504
w=n*Ar/Mr
80/14n+81=0,6504
9n+53=80
9n=27
n=3
Okay can you help me because what it interesting candidate can you help me for my shin and then I have three other people is right very good I don't know what you don't like her
127 J ( 53 р, 53е, 74 n)
p -протоны
e - электроны
n- нейтроны