Question

calculati masa a 12 moli de ioni Fe3+
calculati numarul de ioni din 11 ,25 g ioni Sc3+
calculati masa de oxid de potasiu (K2O) care contine 0,3 moli de K+
URGENT!!!DAU COROANA

Answer 1

A,Fe=56g/mol
m=n(niu)x A
m= 12molx56g/mol= ..................  calculeaza !!

A,Sc=45g/mol
n=m.A
n= 11,25g/45g/mol=0,25mol ioni
n=N/N,A-----> N= 0,25mol x 6,023x10²³ioni/mol=.................calculeaza !!!

M,K2O=(2x39gK+16gO)/mol= 94g/mol
1molK2O.(94g)...........2mol ioni K(+)
         x..........................0,3mol
x= 0,3x94/2=.......................calculeaza masa K2O