How many moles of Co atoms are present in 5.91 · 1019 Co[P(CH3)3]4 molecules? Express your answer in scientific notation. How many moles of O atoms are present in 6.55 · 1022 F2SO2 molecules? If a sample of (NH4)2HPO4 is found to contain 2.85 · 10-3 g of P atoms how many (NH4)2HPO4 formula units are present? Express your answer in scientific notation.