Question

Calculati masa moleculara a urmatoarelor elemente:
a) Mp₄ =....
b)Mnh₃ (amoniac) =.......
c)M ( acid azotic) =.......
hno₃
VA ROOOG AM NEVOIE URGENT!!!

Answer 1

a)M(P4)=124g/mol=4•A(P)
b)M(NH3)=17g/mol=A(N)+3•A(H)
c)M(HNO3)=63g/mol=A(H)+A(N)+3•A(O)

Answer 2

Mp4-nu știu
Mnh3=14+3*1=17 u.a.m.
Mhno3=1+14+3*16=63 u.a.m.