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Masa Mg = 24,3g/mol
1mmol = 24mg Mg²⁺
1mmol = 5,61°n
240mg MgSO₄ --------- x mg Mg²⁺
120300mg MgSO₄ -------- 24300mg Mg²⁺
x = 48,48mg Mg²⁺
48,48mg Mg²⁺ -------- 3dm3
x mg Mg²⁺ ---------------x
x = 16,16mg Mg²⁺
skoro:
1mmol = 24mg Mg²⁺
to:
16,16mg Mg²⁺ = 0,673mmol Mg²⁺
więc:
1mmol = 5,61°n
to
0,673mmol Mg²⁺ = 0,673*5,61 = 3,78°n