Question

Calculati:
a) Numarul de moli din 73kg HCl
b) Masa a 10 moli de Na
c) Numarul de molecule, numarul de atomi si numarul de protoni din 20 de moli de NaOh
Multumesc

Answer 1

a.  M,HCl= 36,5g/mol
     n(niu)= m/M-----> n= 7300g/36,5g/mol=.....................calculeaza !!!

b.M,Na=23g/mol
     m= nxM-------> m=10molx23g/mol=.......................calculeaza !!!

c.  1mol NaOH.........6,023X10²³MOLECULE
    20mol.................N= 120,046X10²³molec= 1,20x10 la puterea25 molec

     1molec     ........................  3atomi
 1,20x10la puterea 25..............x=.3,60x10 la puterea25 atomi

1atom Na are 11protoni
1atom H  are  1 proton
1atom O are 8 protoni---------------Total 10 protoni in 3 atomi

3atomi...................................10 protoni
3,60x10 la puterea 25........x=