AP Chemistry Unit 6

Chapter 6 Thermochemistry

Answers

1. A

2. B

3. D

4. –1429 kj

5. –754 kj

6. –528 kj

7. D

8. +9 kJ, -9 kJ

9. +77 kJ

10. –5 kJ

11. –1.81 kJ, -776 J

12. –375 J

13. +198 kJ

14. +4100 J

15. 27.7°C

16. 0.44 J/g °C

17. +200 cal

18. +240 joules

19. q= -901 J, w=-90.1 J, and ΔE= -991 J.

20. +31.5 kJ/°C, -1100 kJ/mole

21. –3230 kJ/mole

22. –306 kJ/mole

23. +180.5 kJ/mole

24. 22 kJ released

25. –890.37 kJ (?)

26. –414 kJ

27.

2H₂O_2(l) à 2H₂O_(l) + O_2(g) ΔH= -196 kJ

HCl_(g) à H⁺_(aq) + Cl^-_(aq) ΔH= -75 kJ

2NO_2(g) à N₂O_4(g) ΔH= -58 kJ

C₂H_2(g) +H_2(g) à C₂H_4(g) ΔH= -175 kJ

2NaOH_(s) + CO_2(g)à Na₂CO_3(s) + H₂O_(g) ΔH= -125 kJ