MHT CET202522 Apr 2025Morning ShiftChemistrySome Basic Concepts of ChemistryActual
Calculate the number of Cl ⁻ ions in 222 g unhydrous calcium chloride ? (At. mass Ca =40, Cl =35 5 )
Options
- AN _ A
- B2 ~N _ A
- C3 ~N _ A
- D4 ~N _ A
Correct answer
D. 4 ~N _ A
Step-by-step solution
To calculate the number of chloride ions in 222 g of anhydrous calcium chloride, first determine the molar mass of CaCl₂ which is 40 1 + 35.5 2 = 111 g/mol . The number of moles is 222 111 = 2 moles of CaCl₂ . Each entity of CaCl₂ dissociates into two chloride ions, so the moles of Cl⁻ ions are 2 2=4 moles. Multiplying by Avogadro's constant N_ A gives the number of ions as 4 N_ A . This corresponds to option D .