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What is the reference angle of -1.7 degrees? How many electrons does sodium have in its outer shell? How many moles of O2 are left over if 2.0 moles of O2 react with 1.9 moles of H2 to form H2O and the reaction is allowed to go to completion? Advanced Engineering Mathematics Question. Any help is appreciated.? Find the derivative with respect to x of 3x³ + 2 from its first principle?