JAMB Chemistry 2014 Objective — Question 26
Question 26 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2014 Objective paper, with the correct answer and a full explanation.
Advertisement
If the change in free energy of a system is −899Jmol⁻¹ and the entropy change is 10Jmol⁻¹K⁻¹ at 25°C, calculate the enthalpy change.
- A. +649 Jmol⁻¹
- B. +2081 Jmol⁻¹Correct
- C. −2081 Jmol⁻¹
- D. −649 Jmol⁻¹
Explanation
ΔG=ΔH−TΔS. −899=ΔH−(298×10). −899=ΔH−2980. ΔH=−899+2980=+2081Jmol⁻¹.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.