Question

Va rog frumos ajutați-mă.

Answer 1

ms=200g solutie
Cp=9,8% H2So4
p=80%
cp=md/ms*100=>md=Cp*ms/100=9,8*200/100=19,6 g
H2So4 + Mg -> MgSo4 + H2S
98g H2So4..........24g Mg
19.6 g H2So4........xg Mg
x=19.6*24/98=4.8g Mg
p=mp/mimp*100=>mp=p*mimp/100=80*4.8/100=3.84g
c)nr moli H2So4=m/M=19.6/98=0.2 moli
1mol H2So4.........22.4L
0.2 moli................x L gaz
x=4.48 L