Răspuns:
Explicație:
1.
3moli S
react. cu O2
a. ec.
b. masa de SO2 obt.
3moli xmoli
S + O2 = SO2
1mol 1mol
x=3moli SO2
m = n . M
MSO2= 32 + 2.16=64-----> 64g/moli
m= 3moli . 64g/moli= 192g SO2
2.
ms CaO = 400g ,c= 20%
react. cu H2O
a. ec.
b. ms Ca(OH)2 , c=10%
md CaO= c . ms : 100
md= 400 . 20 : 100= 80g CaO
80g xg
CaO + H2O= Ca(OH)2
56g 74g
x= 80 . 74 : 56 =105, 7g Ca(OH)2 ------> md sol. de Ca(OH)2
ms= md .100 : c
ms= 105,7 .100 : 10=1057 g sol. Ca(OH)2
MCaO= 40 + 16=56-----> 56g/moli
MCa(OH)2= 40 + 2.16 + 2=74 -----> 74g/moli