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X - 15g
X=0,08mola
Cm=n/V
Cm=0,08mola/0,9dm3
Cm=0,09 mol/dm3
188=1
x=0,07 mola
cm=0,07/9=0,0088M
1mol AgBr-----188g
xmoli AgBr----15g
x=0,08mola AgBr
n=0,08mola
v=900cm3=0,9dm3
Cm=n/v
Cm=0,08/0,9
Cm≈0,09 mol/dm3