Question

Calculati necunoscutele din ecuatia:
2Na + 2H2O - 2Na OH + H2
2,3g x moli y g z l
​

Answer 1

Răspuns:

Vm=22,4L/mol

M,Na= 23g/mol

M,H2O=18g/mol

M,NaOH= 40g/mol

2x23g.......2x18g...........2x40g......22,4 l

2Na    +   2H2O-----> 2NaOH + H2

2,3g.............x.....................y.................z

x= 2,3x2x18/2x23 g= 1,8g;       niu=m/M= 1,8g/18g/mol= 0,1molH2O

y= 2,3x2x40/2x23 g=4gNaOH

z =2,3x22,4/2x23 l= 1,12 l H2

Explicație: