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mAg=108u
K: Ag(+) + 1e ---> Ag
A: 2H2O ---> O2 + 4H(+) + 4e
4Ag ---- O2
4*108g Ag ----- 22,4dm3 O2
xg Ag ----------- 0,224dm3 O2
x = 4,32g Ag