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x moli------------425g
x=7,26mola NaCl
cm=n/v
cm=7,26mola/1,5dm3=4,84mol/dm3
ms=425g
vr=1,5dm'3
M(NaCl)=23+35,5=58,5mol/dm'3
Cm=425g/58,5mol/dm'3*1,5dm'3
Cm=4,84g/mol