Which of the following does NOT share the same empirical formula as the others?

Question

Which of the following does NOT share the same empirical formula as the others? a. formaldehyde, CH_2O b. butyric acid, CH_3CH_2CH_2COOH c. lactic acid, CH_3CH(OH)COOH d. glucose, C_6H_12O_6 e. acetic acid, CH_3COOH In the application of molecular orbital theory to homonuclear diatomic molecules and ions, _____ a. the number of MOs can exceed the number of AOs used to create them. b. better mixing of AOs leads to a greater energy difference between bonding and antibonding MOs. c. a MO can hold more than two electrons because it can extend over multiple atoms. d. AOs of dissimilar energy mix to form bonding MOs with a greater degree of stabilization. e. inner shell electrons contribute significantly to bonding MOs. Which of the following sets of quantum numbers is allowed? a. n = 1, l = 2, m_l = 0, m_s = +1/2 b. n = 7, l = 0, m_l = 0, m_s = +1/2 c. n = 2, l = 2, m_l = 0, m_s = -1/2 d. n = 5, l = 6, m_l = -2, m_s = -1/2 e. n = 7, l = -1, m_l = -1, m_s = -1/2 The inside of a perfectly insulated capped thermos bottle is an example of _____ a. an undefined system. b. an open system. c. a closed system. d. an isolated system. e. a system plus surroundings.

Explanation / Answer

18. Correct option b, remaining all have empirical formula CH2O .

19. B, Generally, bonding molecular orbitals have less energy and more stabilized, antibonding molecular orbitals have more energy and less stable. Better mixing of atomic orbitals gives more energy difference.

20. B, since l value canot exceed or equal to n value and it should not be negative value. It is an integer and lies between 0 to n-1.

21. D, isolated system, since there is no exchange of matter and energy in isolated system because it is insulated.

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