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2H2O --> O2 + 4H+ + 4e
mol logam Cu = massa/BE
mol = 3.175/31.75 = 0.1 mol
mol elektron = 2/1x 0.1 = 0.2 mol
mol O2 = 1/4 x 0,2 = 0.05 mol
mol N2 = 7/28 = 0.25 mol
PV=nRT
V = n
V/n = konstan
V/n = V/n
5L/0.25 = V/0.05
0.25 = 0.25V
V = 1L