MHT CET202521 Apr 2025Evening ShiftChemistrySome Basic Concepts of ChemistryActual
Calculate the number of Ca ²⁺ ion in 222 g anhydrous calcium chloride? (At. mass Ca =40, Cl =35 5 )
Options
- AN _ A
- B2 ~N _ A
- C3 ~N _ A
- D4 ~N _ A
Correct answer
B. 2 ~N _ A
Step-by-step solution
Calculating Ca ²⁺ ions in 222 g of CaCl ₂ The molar mass of CaCl ₂ is calculated from atomic masses: Ca = 40 g/mol, Cl = 35.5 g/mol. CaCl ₂ = 40 + 2 35.5 = 111 g/mol The number of moles present is: 222 111 = 2 moles Each mole of CaCl ₂ contains 1 mole of Ca ²⁺ ions, giving 2 moles of Ca ²⁺ ions. The total number of ions is: 2 N _ A = 2 N _ A