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n=m/M
n=9,5g/95g/mol
n=0,1mol
800cm3=0,8dm3
Cm=n/V
Cm=0,1mol/0,8dm3
Cm=0,125mol/dm3
Co do 2 to chyba coś z trescia pomieszałas...
Cm=2mol/dm3
ms - 69g
M K2CO3=138g/mol
n=m/M
n=69g/138g/mol
n=0,5mol
Cm=n/V
V=n/Cm
V=0,5mol/2mol/dm3
V=0,25dm