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Avogadro's constant (L):
6.02 x 1023 particles in 1 mole
Number of moles = number of particles you have
number of particles in a mole

Atoms of the same element with the same atomic number but a different number of neutrons
E.g carbon- 12 and carbon- 14…

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6 7 -1

Gamma: No change in atoms, just a release of energy from the nucleus.

Half Life: the time it takes for half the radioactive nuclei in a sample to decay.
The half life is fixed for any given radioisotope and is not affected by temperature.

Iodine -131 has…

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Standard State: 1 atmosphere pressure + 298K (25ºC)

Enthalpy change in combustion: The enthalpy change when 1 mole of a substance burns
completely in oxygen under standard conditions

Enthalpy change of formation: The enthalpy change when 1 mole of a substance is formed from
its constituent elements. Both reactants and…


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