1. c=mdx100/ms sau c/100=md/ms
20/100=md1/300---> md1=60g 10/100= md2/200---> md2= 20g
5/100= (md1+md2)/(ms1+ms2+x)--> 5/100= 80/(500+x)---> x=1100g apa
2. md1= 0,48ms1 md2= 0,38ms2
40/100= (0,48ms1+0,38ms2)/ (ms1+ms2)-
48ms1+38ms2=40ms1+40ms2----> ms1/ms2= 1/4
3 18.25/100=md/20---> md=m HCl= 3.65g
niu.HCl=m/M= 3,65/36,5mol= 0,1mol
1mol.....3mol.................1,5x22,4 l Vm= 22,4 l/mol
M+ 3HCl----> MCl3 + 3/2 H2
x..........0,1mol...................y
y= 3,36 l
x= 0,1/3 mol
0,1/3mol M...............0,9g
1mol............................x= 27g/mol----> Al