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2 cards from this section. Quick, good the night before a test.
Calculate the molar mass of methane (CH4).
Add the atomic masses of carbon and hydrogen.
What is the mass percent of Na in sodium sulfate (Na2SO4)?
Use the formula: (mass % of element = (number of atoms of element × atomic mass of element) / molar mass of compound × 100)
What is the molar mass of a compound with the formula C3H8?
Remember to sum the individual atomic masses.
True or False: The empirical formula always represents the actual number of atoms in a molecule.
Think about the definitions of empirical and molecular formulas.
If 5 mL of a 2 M NaCl solution is diluted to a final volume of 500 mL, what is the concentration of the diluted solution?
Use the dilution formula: C1V1 = C2V2.
A compound C consists of 10 g of carbon and 30 g of oxygen. Find the empirical formula.
Calculate moles and simplify the ratios.
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