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amaAlicdgsdaugensi
amaAlicdgsdaugensi amaAlicdgsdaugensi
  • 16-08-2016
  • Chemistry
Answered

The density of solid Cr is 7.15 g/cm3. How many atoms are present per cubic centimeter of Cr?

Verified Answer :

taskmasters
taskmasters taskmasters
  • 20-08-2016

To calculate the number of atoms of Cr, we first find the number of moles per unit of cubic centimeter of Cr. Then, use avogadros number for the number of atoms. Calculations are as follows:

1 cm^3 (7.15 g/cm^3) (1 mol / 51.996 g Cr) = 0.14 mol Cr

0.14 mol Cr ( 6.022 x 10^23 atoms Cr / 1 mol Cr ) = 8.28 x 10^22 atoms Cr

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