Question

Se ard 2 moli de sodiu in clor molecular.Calculati:a)masa de substanta rezultata
b)nr de moli de clor reactionat
c)nr de molecule de clor consumate

Answer 1

2 moli .. n moli .... a g

 2Na  +  Cl2  -->   2NaCl

2 ..........  1  ........ 2 x 58,5 g/mol

a)

=> a = 2 x 2 x58,5 / 2 = 117 g NaCl

b)

=> n = 1 mol Cl2

c) n = nr moli = N / NA, unde NA = nr lui Avogadro = 6,022 x 10la23

=> N = n x NA = 1 x 6,022 x 10la23 = 6,022 x 10la23 molecule Cl2