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3 cards from this section. Quick, good the night before a test.
What is the empirical formula?
Think of it as the reduced form of the chemical formula.
What does the molecular formula tell us?
It's a complete version, unlike the empirical one.
What is the ratio of elements in an empirical formula?
Think of it as a simplified version of a chemical formula.
True or False: The molecular formula can be exactly the same as the empirical formula.
Consider compounds where elements have the same ratios.
A compound is found to contain 35.0% Carbon, 7.0% Hydrogen, and 58.0% Oxygen by mass. Calculate both the empirical and molecular formulas given the molar mass is 180 g/mol.
Convert mass percentages to moles, find ratios, then apply molar mass.
Given a compound composed of 10.0 g of Nitrogen and 30.0 g of Oxygen, find the empirical and molecular formulas given its molar mass of 90 g/mol.
Use the masses to find moles, then ratios to find empirical, followed by molar mass for molecular.
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