Many compounds tend to have the same empirical formulas as their molecular formulas for example the empirical formula and molecular formula for h 2 o and co 2 are the same example if a compound has a percent composition of 856 carbon and 144 hydrogen what is the empirical formula 1 assume the sample is 100 g mass of carbon 856 g. If you can divide all of the numbers in a molecular formula by some value to simplify them further then the empirical or simple formula will be different from the molecular formula the empirical formula for glucose is ch 2 o glucose has 2 moles of hydrogen for every mole of carbon and oxygen the formulas for water and hydrogen peroxide are. Start studying chemistry unit 7 empirical and molecular formulas learn vocabulary terms and more with flashcards games and other study tools
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