Question

Ajutor. Repedeee. Pana la ex 10

Answer 1

8.

MgSO4*7H2O , miu =120+126 = 246 g/mol

246 g  cristalo.............. 120 g MgSO4 ............. 126 g apa

49,2 g ............................. a g MgSO4 .................. b g apa

a = 24 g MgSO4  ,  b = 25,2 g apa

=> ms = 24 + 25,2 + 150,8 = 200 g

md = 22,54

c% = mdx100/ms = 24x100/200 = 12% => b)

9.

BaCl2 , c)

BaCl2 + H2SO4 => BaSO4↓ + HCl

10.

H2SO4 = 98 g/mol

5 moli x 98 = 490 g H2SO4

98 g H2SO4 ...... 32 g S

490 g H2SO4 ....... a = 160 g S => d)