4KNO3+5C=2N2+3CO2+2K2CO3
C 0---->C +4 +4e|*5
N +5 +5e----> N 0 |*4
404g KNO3....60gC......464g amestec
a g KNO3......b g C.....93,8g amestec
a=93,8*404/464=81,67g=>0,8moli KNO3
b=93,8-81,67=12,3g=>1.01moli aprox. 1mol
4moli KNO3....2moli N2....3moli CO2
0,8moli KNO3....xmoli N2....y moli CO2
x=0,8*2/4 =0,4 moli N2
y=0,8*3/4= 0,6moli CO2
Nr moli gaze =0,4+0,6=1 mol
t=17C=>T=290K
pV=nRT=>V=nRT/p=23,78L