The mass of 2.55 mol [tex]\rm Cu_2CrO_4[/tex] has been 504.007 g.
The mass of a mole of a compound has been equivalent to the molar mass of the compound.
The molar mass has been the sum of mass of each constituent in the formula unit. The molar mass of [tex]\rm Cu_2CrO_4[/tex] has been 197.56 g/mol.
The mass of 2.55 mole sample has been:
[tex]\rm 1\;mol=197.65\;g\\2.55\;mol=2.55\;\times\;197.65\;g\\2.55\;mol=504.0075\;g[/tex]
The mass of 2.55 mol [tex]\rm Cu_2CrO_4[/tex] has been 504.007 g.
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