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masa 1 mola kwasu solnego HCl: 1g + 35,45g = 36,45g
1mol ---- 36,45g
x mol ---- 3,645g
x = (1mol * 3,645g) : 36,45g = 0,1mol <---- liczba moli substancji w roztworze
Cm = n / V
Cm = 0,1mol / 0,5dm³
Cm = 0,2 mol/dm³