Question

repede va rog
dau coroana​

Answer 1

Răspuns:

3

.v= 3l=3000ml

ro=m/v--> m- roxv= 3000x1 g= 3000g

4.

ca sa calculezi c%. aplici relatia

c=mdx100/ms= mdx100/ ( md+ 3000) unde md este masa de NaCL dizolvata in apa

5

a..reactia dintre un acid si o baza este reactie de neutralizare

b.m=300gNaOH impur   p= 80%

p= m,px100/m,i---> m,p= 300x80/100g= 240gNaOH pur

M,NaOH= 40g/mol

niu=m/M= 240/40mol=6molNaOH

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

NaOH + HCl----> NaCl + H2O

6mol,......................x= niu=6molNaCl

c.

m,i= m,impur-m,pur=300-240=>60g

d

M,NaCl=58,5g/mol

niu=m/M= 50/58,5 mol=0,85molNaCl

e.

M,H2O=18g/mol

niu=m/M= 3/18mol=0,167mol H2O

Explicație: