Question

Ajutorrrrrr dau coroana

Answer 1

Răspuns:

-calculez masa si moli NaOH, stiind miu,NaOH=40g/mol

c=mdx100/ms= > md= 20x800/100g=160gNaOH

niu=m/miu= 160/40mol= 4mol NaOH

-calculez moli si masa HCl, stiind miu,HCl= 36,5g/mol

1mol.........1mol

NaOH + HCl------> NaCl + H2O

4mol.......x

x= niu= 4mol HCl

m=niuxmiu= 4x36,5 g=146gHCl

aceasta masa se gaseste dizolvata in solutie, deci este md

-calculez masa solutiei de acid

c=mdx100/ms--->ms=146x100/3,65g=4000g

Explicație: