Question

Va rog rezolvati B si C​

Answer 1

Răspuns:

B

n=15 moli H2O

MH2O=2×1+16=18g/mol

MNaOH=23+16+1=40g/mol

m=15×18=270gH2O

scriem reactia dintre Na si apa

       2×18g     2×40g

2Na+2H2O→  2NaOH + H2↑

       270g    ygNaOH

y=270×2×40/2×18=600g NaOH

C

MH2=2×1=2g/mol

MH2O=2×1+16=18g/mol

m=15×18=270gH2O

     2×18g                     2g

2Na+2H2O→  2NaOH + H2↑

       270g                     zg

z=270×2/2×18=15g H2

Explicație: