a)
100% amestec impur - 20% impuritati = 80% puritatea carbunelui
150 kg carbune impur ....... 100%
m kg carbune .................... 80%
=> m = 150x80/100 = 120 kg carbune pur
120 kg a kg n1 kmoli n2 kmoli
C + H2O --> CO + H2
12 18 1 1
=> n1 = 120x1/12 = 10 kmoli CO
=> n2 = 120x1/12 = 10 kmoli H2
=> n1+n2 = 20 kmoli amestec gazos
b)
a = 120x18/12 = 180 kg apa