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87g MnO2 - 36g H2O
17,4 g MnO2 - X
X=7,2g H2O powstanie w reakcji z 17,4g MnO2
mH2O=18u
MnO2 +4HCl -->MnCl2 + Cl2 + 2H2O
87g MnO2------2*18g H2O
17,4g MnO2-----xg H2O
x=7,2g H2O