Răspuns:
calculez moli Na, stiind A,Na= 23g/mol
niu=m/A= 46/23MOL=2mol
deduc moli si masa NaOH ,din ecuatia chimica, stiind miu,NaOH= 40g/mol
2mol..........................2mol
2Na + 2H2O---> 2NaOH + H2
2mol..............................x
x=niu=2mol NaOH
m=niuxmiu=2x40g=80gNaOH
Explicație: