Răspuns:
Explicație:
a) sulfat de zinc
b) Ra=1:1:4
c)Rm =65:32:4*16=65:32.64
d) 161 g.....65g....32g.....64 g
100g....x..........y...........z
e )M=65+32+64=161
n=m/M m=n*M =1,5 moli*161g/mol=193 g
f) n=m/M=805 g/161 g/mol=5 moli
g 1mol........65 g Zn
4moli x
x=260 g
h) 161g ..........32.g S
x..................9,6 g
x=48,3 g