39. Which electron configuration represents a potassium atom in the excited state?
(1) 1s 2s 2p 3s 3p
(2) 1s 2s 2p 3s 3p4
(3) 1s²2s2p 3s 3p45
(4) 1s 2s 2p 3s 3p545

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Problem page gaseous ethane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . if of water is produced from the reaction of of ethane and of oxygen gas, calculate the percent yield of water. be sure your answer has the correct number of significant digits in it.