Enthalpy of solution and hydration Quiz
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5 questions, one answer each
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1. What is the starting species in the definition of the enthalpy change of hydration?
- A. One mole of ionic solid
- B. One mole of gaseous ions
- C. One mole of aqueous ions
- D. One mole of water
2. The lattice energy of a compound is −800 kJ mol⁻¹ and the total hydration enthalpy of its ions is −780 kJ mol⁻¹. What is the enthalpy change of solution?
- A. −20 kJ mol⁻¹
- B. −1580 kJ mol⁻¹
- C. +1580 kJ mol⁻¹
- D. +20 kJ mol⁻¹
3. Which ion has the least exothermic enthalpy change of hydration?
- A. Li⁺
- B. Na⁺
- C. K⁺
- D. Mg²⁺
4. Which change makes the lattice energy of an ionic compound more exothermic?
- A. Higher ionic charges and smaller radii
- B. Larger ionic radii
- C. Lower ionic charges
- D. Using the hydrated ions
5. For magnesium chloride, how many times is the hydration enthalpy of Cl⁻ included in the cycle?
- A. Once
- B. Twice
- C. Three times
- D. It is not included