Question

Imi trebuie pentru nota!!! Folosind relatia: numar de moli=m\masa molara; calculati numarul de moli de a)9,8g H2SO4
b)1kg CaSo3
c)980g H3Po4
d)1,8kg H2O
e)1060g Na2Co3

Answer 1

Răspuns:

Explicație:

n=nr.moli       ;   m=masa subst . (g) ;   M=masa molara ( g/moli )

n = m : M

a.

MH2SO4=2+32+4.16=98---->98g/moli

n=9,8g :98g/moli= 0,1moli H2SO4

b.

MCaSO3=40+32 +3.16=120---->120g/moli

n= 1000g :120g/moli=8,33 moli CaSO3

c.

MH3PO4=3+ 31 +4.16=98---->98g/moli

n=980g : 98g/moli=10 moli H3PO4

d.

MH20=2+16=18---->18g/moli

n=1800 g : 18g/moli=100 moli H2O

e.

MNa2CO3=2.23+12 +3.16=106----->106g/moli

n=1060g : 106g/moli=10 moli