Question

Va rog urgent! Ex 5,6,7 dau 40 de puncte va rog mult

Answer 1

7)a)
m/M=V/Vm=>m=M×V/Vm=58×6,72/22,4=17,4 g amestec
m=17,4-2,8=14,6 g etan
n=m/M
n=2,8/28=0,1 moli etenă(C2H2)
n=14,6/30=0,48 moli etan(C2H6)
0,58moli...0,1moli etenă...0,48moli etan
100...................p1.........................p2
p1=0,1×100/0,58=17,24% etenă
p2=0,48×100/0,58=82,75% etan
b)
Nu pune punctele
2,8................x
CH2=CH2+Br2-->CH2-CH2
28.................160.........|.......|
...................................Br.....Br
x=160×2,8/28=16 mg Br2
c=md×100/ms-->ms=md×100/c=16×100/2=800 mg soluție de Br2