Răspuns:
A,Hg=200g/mol
miu,O2=32g/mol
miuHgO=216g/mol
-calculez masa de oxid pur, stiind p=90%
p=m,px100/m,i---> m,p= 600x90/100g=540gHgO
-calculez masele teoretice de Hg si O2 din ecuatia chimica
2mol 2mol 1mol sau, in grame
2HgO --> 2Hg + O2
2x216g......2x200g....32g
540g...........x................y
x=m,teor=500g Hg
y=m,teo= 40g O2
-calculez masele practice , stiind 70/100= m,pr/m,teor
m,pr=350gHg
m,pr=28gO2
Explicație:
