Răspuns:
miuHCl=36,5g/mol
mHCl=niuxmiu=4x36,5g=146g
miu,H2O=18g/mol
m,H2O=niuxmiu=100x18g=1800g
c=mdx100/ms unde ms=md+m,apa
md= 146gHCl ms=146g+1800g=1946g
c= 146x100/1946=7,5%
ms= 5000g
c= 0,85%
md= cx ms/100= 0,85x5000/100g=42,5g NaCl
m,apa= ms-md= 5000-42,5=> 4957,5g
Explicație: