BNA, NA2O, K, K2O, BA, BAO + H2O  NAOH + H2 *KOH BA(OH)2NH2 = 0,07 MO...

8, - DE THI THPTQG 2017 THEO CAU TRUC
DE THI THPTQG 2017 THEO CAU TRUC
8,75 =12,8gam  m

O

= 1,12 gam (8,75%) => m

X

= 100.1,12