Răspuns:
Explicație:
1.
-se afla masa molara de PbI 2
M= 207 + 2.127=461-------->461g/moli
-se afla masa de Pb din 46,1 g PbI2
461g PbI2-------------207g Pb
46,1 g PbI2--------------Xg
x= 46,1 . 207 : 461=20,7 g Pb
-se afla masa molara aPb(NO3)2
m= 207 + 2.14 + 6.16=331 -------> 331g /moli
-se afla masa de Pb(NO3)2 care contine 20,7g Pb
331g Pb(NO3)2---------207g Pb
yg----------------------------------20,7gPb
y= 331 . 20,7 : 207=33,1g Pb(NO3)2
b.
MKI = 39+ 127=166------> 166g/moli
n= 3613,2.10²³: 6,023.10²³=599,9 moli = 600moli
1mol KI---------------6,023.10²³K
600moli--------------------x
x=600. 6,023.10²³K