Question

1.Calculeaza masa de apa necesara reactiei a 2,4 tone carbune cu un continut de 80 la suta carbon.Ce numar de molecule de h rezulta?
2.Calculeaza masa de metan care se formeaza prin reactia cu hidrogenul a 320 kg carbune ce are un continut de 75 la suta carbon

Answer 1

1
C + H2O = CO + H2 
%C = mC/m cărbune * 100
mC = 2,4*80/100 = 1,92 tone C = 1920 kg C
M C = 12 g/mol
M H2O = 18 g/mol
12 g C.......18 g H2O........1 mol H2
1920 kg C..............x.....................y
x = 2880 kg H2O
y = 160 kmoli H2
n = nr.molecule/nr. Avogadro
nr molecule = 160*10^3*6,022*10^23 = 9,6352*10^28 molecule H2

2
C + H2 = CH4
%C = mC/m cărbune * 100
mC = 320*75/100 = 240 kg C
M C = 12 g/mol
M CH4 = 16 g/mol
12 g C.............16 g CH4
240 kg C...............x
x = 320 kg CH4