Question

Acidul azotic concentrat are actiune oxidanta asupra sulfului,din reactie rezultand acid sulfuric si monoxid de azot,care in contact cu aerul trece in dioxid de azot.
a) Studiati si stabiliti coeficientii ecuatiilor celor doua reactii
b) Considerand reactiile totale,calculati masa de sulf care poate fi oxidata de 50mL solutie de acid azotic de concentratie 10,3 M
c) Calculati volumul de dioxid de azot degajat in conditii normale.

Answer 1

a)S + 2HNO3 -> H2SO4 + 2NO
2NO + O2 -> 2NO2
b) n=Cm*Vs=10,3*0,05=0,515moli
32g..2moli......................2moli
S + 2HNO3 -> H2SO4 + 2NO
x=?..0,515moli..............0,515moli
x=0,515*32/2=8,24g S
c)
2moli............44,8L
2NO + O2 -> 2NO2
0,515.............y=?
y=0,515*44,8/2=11,536L NO2