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Questions and Answers
What is the volume of one mole of an ideal gas at standard temperature and pressure?
What is the volume of one mole of an ideal gas at standard temperature and pressure?
What is the value of Avogadro's constant?
What is the value of Avogadro's constant?
What is the standard temperature in Kelvin?
What is the standard temperature in Kelvin?
What is the formula to convert between moles and mass?
What is the formula to convert between moles and mass?
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What is the defining characteristic of a mole of a substance?
What is the defining characteristic of a mole of a substance?
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What is the relationship between the volume of a gas and the number of molecules it contains?
What is the relationship between the volume of a gas and the number of molecules it contains?
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What is the significance of the number 6 x 10^23 in the context of moles?
What is the significance of the number 6 x 10^23 in the context of moles?
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Study Notes
Mole Definitions
- A mole of a substance is the amount of that substance that contains as many particles (atoms, molecules, or ions) as there are atoms of 12C in 12g of 12C.
Avagadro's Law
- Equal volumes of gases, under the same conditions of temperature and pressure, contain equal numbers of molecules.
Mole and Particle Equivalence
- 1 mole = 6 x 10^23 atoms or molecules or ions.
Standard Temperature and Pressure (STP)
- 1 mole = 22.4 L = 22,400 cm^3 at STP.
- Standard temperature = 273 K at STP.
- Standard pressure = 101,325 Pa at STP.
Moles and Mass Conversion
- Key formula: moles x Mr = Mass (in grams).
- Memorize this formula for converting to moles.
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Test your understanding of the mole.
