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n= m(massa) gr/Mr(molekul relatif)
Mr NaCl = Ar(atom relatif) Na+Ar Cl
Mr NaCl = 23+35,5
Mr NaCl = 58,5
n=5/58,5
n=0.08...
M = n/v
M = 0.08/0.25
M = 0,35 gr/L
maaf bila ada kesalahan