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100cm3 czyli 0,1dm3 0,5M roztw.MgCl2 zawiera n = c*V=
0,1dm3*0,5mola/dm3 = 0,05 mola MgCl2
2 C17H35COONa + MgCl2 = ( C17H35COO )2Mg + 2 NaCl
1 mol-------------- 590g
0,05mola------------- x
---------------------------------
x = 0,05mola*590g/1mol = 29,5g stearynianu magnezu
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