Răspuns:
c=mdx100/ms===> md=40x200/100g=80g metanal
miu,metanal=30g/mol
30g................................................................................4x22,4 l
HCOH + 2[Ag(NH3)2]OH---> HCOOH +2Ag + 4NH3 + H2O
80g.................................................................................x
x=v=239 l NH3
Explicație: