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2 cards from this section. Quick, good the night before a test.
Calculate the molecular mass of water (H2O).
Add the atomic masses of hydrogen and oxygen.
What is the mass percent of hydrogen in H2O?
Use the formula and remember to multiply by 100.
What is the formula for percentage composition?
Remember the relationship between mass of a part and whole.
True or False: Molar mass is the total mass of a single atom of an element.
Think about how many atoms are in a mole.
Analyze a sample containing 33g of sodium in 100g of sodium chloride. What is the percentage composition of sodium in NaCl?
Find total mass of the compound first.
Given a compound contains 12g of hydrogen, 48g of carbon, and 48g of oxygen, find the empirical formula.
Convert to moles and simplify the ratios.
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