Wie rechne ich... mit Stoffmenge anstatt Masse?

mFeU = 55.8 %u
mFeU = 55.8000
mFe = 1 %kg
mFe = 1
nH2O = 8 %mol
nH2O = 8
mHU = 1.01 %u
mHU = 1.0100
mOU = 16 %u
mOU = 16

Masse Eisen zu Stoffmenge

n = mFe / mFeU * 1000
n = 17.9211

Mol H20 zu Masse

MH2O = 2*mHU + mOU
MH2O = 18.0200
mH2O = nH2O * MH2O
mH2O = 144.1600