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9g H₂O = x g H₂ + (5,6 dm³*1,43g/dm³) O₂
x g H₂ = 9g H₂O - 8,008 g O₂
x g H₂ = 0,992 g H₂
1 mol --- 22,4 dm3
x mol --- 5,6 dm3
x = 5,6/22,4 = 0,25 mol
m = n*M
m = 0,25 * 32
m = 8g
9g-8g=1g
Odp: 1g wodoru.
Dane:
mH2O - 9g
VO = 5,6 dm3
dO= 1,43 g/dm3
mO=dV
mO= 1, 43 g/dm3 * 5, 6 dm3
mO= 8,008 g
m2H2O - mO2= m2H2
9g - 8,008 g= 0,992 g