consideram ms = 100g = m H2O2 + mH2O
mH2O2 = c·ms/100 = c mH2O = 100 - mH2O2 = 100 - c
n H2O2 = c/34 nH2O = (100-c)/18
nH = 2·c/34 + 2·(100 - c)/18 = c/17 + (100 - c)/9 = (1700 - 8c)/153 = mH
(1700 - 8c)/153 = 10,9545
1700 - 8c = 1676,0385 8c = 23,9615 c = 3%