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5 cards from this section. Quick, good the night before a test.
What is Avogadro's constant?
Think of how many atoms are in one mole of carbon.
How is molar mass derived for elements?
Look at how the periodic table lists atomic masses.
What is the molar mass of water (H₂O)?
Check the values of Hydrogen and Oxygen from the periodic table.
Avogadro's constant is approximately equal to:
Remember what a mole represents.
You need to produce 2 moles of water from H₂ + O₂, but you start with 1 mole of H₂ and 1 mole of O₂. How many moles of water can you actually produce?
Calculate the ratio required for complete reaction.
Given a 100 g sample containing 40% carbon, what is the mass of carbon in the sample? Additionally, what is the number of moles of carbon?
Take 40% of 100 g to find mass first, then use molar mass to find moles.
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