7 Questions
What is the volume of one mole of an ideal gas at standard temperature and pressure?
22.4L
What is the value of Avogadro's constant?
6 x 10^23
What is the standard temperature in Kelvin?
273K
What is the formula to convert between moles and mass?
moles x Mr = Mass
What is the defining characteristic of a mole of a substance?
It contains the same number of particles as there are atoms in 12g of 12C
What is the relationship between the volume of a gas and the number of molecules it contains?
The volume of a gas is directly proportional to the number of molecules it contains
What is the significance of the number 6 x 10^23 in the context of moles?
It is the number of particles in a mole of a substance
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.
Test your understanding of the mole.
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