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Równanie reakcji:
H2+Cl2=2HCl;
2[mole] HCl - 44,8[dm3];
x[moli] HCl - 11,2[dm3];
x=0,5[mola] HCl.
1[mol] Cl2 - 2[mole] HCl;
x[moli] Cl2 - 0,5[mola] HCl;
x=0,25[mola] Cl2.
1[mol] Cl2 - 71[g];
0,25[mola] Cl2 - x[g];
x=17,75[g] Cl2.
Odp.Należy wziąć 17,75[g] Cl2.