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musimy obliczyć x więc tworzymy układ równań
23*2+32+16*4+18*x=322
46+32+64+18x=322
18x=322-142
18x=180
x= 10
Wzór: Na2SO4 * 10 H2O
mH₂O = 2 x 1u + 16u = 18u
322u - 142u = 180u
180u : 18u = 10
indeks x = 10