Question

Va rog ex 6 urgent !!

Answer 1

Răspuns:

A,K=39g/mol

miu,H2O=18g/mol

miu,KOH=56g/mol

2x39g......2x18g........2x56g

2K   +  2H2O------> 2KOH+  H2

2,72g..........x................y

x=1,255gH2O

Y=3,91gKOH

SOLUTIA este formata din KOH si apa\

c=mdx100/ms,      unde md= 3,91gKOH

m,s= 3,91x100/20g=19,55g

dar ms= md+m,apa----> m,apa=19,55g-3,91g=15,64g

masa totala de apa => m,apa din sol+ m,apa intrata in reactie

                                     15,64g+ 1,25g= 16,89g