Question

Ex 1 si 2 !!! Dau 100 de puncte si coroana !!!! Aveti poza atașata!!!

Answer 1

Răspuns:

1

n=0,2moli

1mol...1mol.......1mol...........1mol

Zn + H2SO4 → ZnSO4 + H2 ↑

0,2moli...xmoli....ymoli....zmoli

x=0,2moli

y=0,2moli

z=0,2moli

MH2SO4=2x1+32+4x16=98g/mol

n=0,2moli H2SO4

n=m/M

m=nxM=0,2x98=19,6g H2SO4

2.

n=5moli H2

MHCl=1+35,5=36,5g/mol

MMg=24g/mol

1mol....2moli.................1mol

Mg + 2HCl → MgCl2 + H2↑

ymoli......zmoli................5moli

y=5moli Mg

z=5x2/1=10moli HCl

n=m/M

m=nxM=10x36,5=365gHCl

m=nxM=5x24=10gMg

Explicație: