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
