Question

300 g solutie apoasa de acid formic 23% reactioneaza cu Mg in exces. Ce volum de H2 se degaja?

Answer 1

ms = 300g sol. HCOOH
C = 23%

C = md/ms×100 => md = C×ms/100 = 23×300/100 = 69g HCOOH

n = m/M = 69/46 = 1,5 moli HCOOH

2HCOOH + Mg => (HCOO)2Mg + H2

2 moli HCOOH........................22,4L H2
1,5 moli HCOOH.....................x L H2

x = 16,8L H2