Use the feferences to access important values if needed for this question. a. How many moles of dinitrogen tetroxide, N2O4, are present in a sample that contains 4.51 moles of oxygen atoms? miol N2O4 b. How many moles of oxygen atems are present in a sample that contains 3.13 moles of N2O4 ? miol 0 Use the References to access important values if needed for this question. a. How many moles of dinitrogen tetroxide, N2O4, are present in a sample that contains 4.51 moles of oxygen atoms? molN2O4 b. How many moles of oxygen atoms are present in a sample that contains 3.13 moles of N2O4 ? molO