Răspuns:
Explicație:
4 a)n CaO=5 moli
m=?
MCaO=40+16=56
m =n*M=5 moli *56 g/mol= 280g
b)m MgCl2=380 g
n=?
M MgCl2=24+2*35,5=95
n=m/M=380 g/95 g/mol=4 moli
5 . NH4NO3 a) M=14+3+14+3*16=69
b) Ra= N:H:O=2:4:3
Rm = N:H:O= 24:4:48=6:1:12
c)n=m/M=16 g/69 g/mol=0,23 moli
