Răspuns:
c=mdx100/ms
md= 740g
ms,=md+m,apa= 740g+1260g=2000g
c= 740x100/2000=>37%
2mol..............1mol
2HNO3 + Ca(OH)2----> Ca(NO3)2 + 2H2O
2x63g...............74g deoarece M,HNO3=63g/mol M,Ca(OH)2=74g/mol
x.............................740g
x=m= 1260g HNO3
Explicație: