If a sample of LiNO3 is found to contain 2.03 · 1018 N atoms how many moles of O atoms are present? Express your answer in scientific notation. If a sample of CO is found to contain 2.78 · 1018 O atoms how many CO molecules are present? Express your answer in scientific notation. How many C atoms are present in 0.902 g of C2H4 molecules? Express your answer in scientific notation.