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M H2O = 2*1+16=18g/mol
V0 = 22,4dm³/mol
nH2 = V/V0 = 20/22,4 = 0,9 mola H2
2H2O > O2 +2 H2
2 mole H2O ---------2 mole H2
x ---------------------0,9 mola H2
x = 0,9 mola H2O
m = n*M = 0,9*18 = 16,2 g H2O