Showing posts with label Mole. Show all posts
Showing posts with label Mole. Show all posts

Sunday, 25 May 2014

1.56 recall that one faraday represents one mole of electrons

1 Faraday = 1F

Coulombs = Quantity of Charge

Coulombs (C) = Current (A) x Time (s)

1F = 96,500 Coulombs (C)


1 mol of electrons = 1F or 96,500C

1.20 understand the term molar volume of a gas and use its values (24 dm3 and 24,000 cm3) at room temperature and pressure (rtp) in calculations.

Molar Volume Gases

One mole of any gas has a volume of 24 dm3 (24,000 cm3) at RTP

Volume of gas (dm3) = amount x 24 

Volume of gas (cm3) = amount x 24,000

Amount (mol) = volume of gas (cm3) / 24,000

NB -  if the volume is in cm3 then use 24,000 in your calculations and vice versa.

1.18 understand the term mole as the Avogadro number of particles (atoms, molecules, formulae, ions or electrons) in a substance

The Mole

The mole is a measure of an amount of substance.
One mole is the amount of a substance that contains 6 x 1023 particles (atoms, molecules, formula, ions or electrons). 6 x 1023 is the Avagadro Number.
e.g.
1 mol of Na contains 6 x 1023 atoms of sodium
1 mol of H2 contains 6 x 1023 molecules of hydrogen
1 mol of NaCl contains 6 x 1023 formulae of sodium chloride.