Question

ex. 10 și 11
Dau coroana.
Mulțumesc anticipat.

Answer 1

MNa2SO4=2*23+32+64=142g/mol
a) 142g Na2SO4........64g O2
   xg..............................32g
x=142*32/64=71g Na2SO4
b) n=N/NA(nr lui Avogadro)=6.023*10^23/6.023*10^23=1 mol Na
nr moli=m/M =>m=nr moli*M=1*142=142g
c) 142 kg Na2So4........32 Kg Sulf
 xKg...........................6.4 kg Sulf
x=142*6.4/32=28.4 kg Na2SO4
d) 142g Na2SO4.............46g Na
  xg............................11.5 g Na
x=142*11.5/46=35.5 g Na2SO4