Hess's law and enthalpy cycles Quiz
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5 questions, one answer each
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1. Which law states that the enthalpy change is independent of the route taken?
- A. Le Chatelier's principle
- B. Hess's law
- C. Avogadro's law
- D. Boyle's law
2. ΔfH of NO₂(g) is +33 kJ mol⁻¹ and of NO(g) is +90 kJ mol⁻¹. What is ΔH for NO + ½O₂ → NO₂?
- A. +123
- B. –57
- C. +57
- D. –123
3. For a reaction, ΔcH(reactants) total = –3000 and ΔcH(products) total = –2800 kJ mol⁻¹. What is ΔrH?
- A. –5800
- B. +200
- C. +5800
- D. –200
4. The reverse of a reaction with ΔH = –92 kJ mol⁻¹ has ΔH equal to:
- A. –92
- B. –46
- C. +92
- D. +46
5. Which measure must be the same in both experiments of Core Practical 2?
- A. The mass of solid
- B. The colour of the acid
- C. The volume and concentration of acid
- D. The size of the beaker