A #5.67*g# mass of chromium metal represents what molar quantity?

1 Answer
anor277
May 9, 2016

#"Moles" = "Mass"/"Molar Mass"#

Explanation:

#"Moles of Chromium" = "Mass of chromium"/"Molar mass of chromium"#

#=# #(5.67*g)/(51.99*g*mol^-1)# #=# #0.109*mol#

So what is a mole? It is simply a number, #6.022xx10^23#. It is a fact that #"Avogadro's number"# of chromium atoms have a mass of #51.99*g#. Thus #"Avogadro's number"#, #N_A#, is the link between the micro world of atoms and molecules, to the macro world of grams and litres, that which we can suitably measure in a lab.

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