Question 1
Each of the three resonance structures of NO
3– has how many lone pairs of electrons?
◦ 7
◦ 8
◦ 9
◦ 10
◦ 13
Question 2
Estimate the enthalpy change for the combustion of one mole of acetylene, C
2H
2, to form carbon dioxide and water vapor.
BE(C–H) = 456 kJ/mol
BE(C≡C) = 962 kJ/mol
BE(O=O) = 499 kJ/mol
BE(C=O) = 802 kJ/mol
BE(O–H) = 462 kJ/mol
◦ +1010 kJ/mol
◦ +653 kJ/mol
◦ –155 kJ/mol
◦ –1010 kJ/mol
◦ –1759 kJ/mol