Tarkibida karnallit minerali tutgan 30 g ruda mo'l olingan kumush nitrat eritmasida eritilganda 0,3 mol tuz cho'kmaga tushdi. Rudaning tozalik darajasini (%) aniqlang.
- 95
- 92,5
- 87,5
- 90
📝 Detailed explanation
Karnallit — KCl·MgCl₂·6H₂O, M = 74,5 + 95 + 108 = 277,5 g/mol. 1 mol da 3 mol Cl⁻.AgNO₃ + Cl⁻ → AgCl↓.
0,3 mol AgCl → 0,3 mol Cl⁻ → 0,1 mol karnallit.
Karnallit massasi: 0,1·277,5 = 27,75 g.
Tozalik: 27,75/30·100% = 92,5%.