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superman1987
When 1 mol of Cr2O3 has 2 mol of Cr, So we can easily get the number of moles of Cr in  2.16 mol of CrO3 by:
Cr     → Cr2O3
2 mol→ 1 Mol
 X      → 2.16 Mol
So X (the no. of mol of Cr ) = 2 Mol * 2.16 Mol = 4.32 Mol

Answer:There are 4.32 moles of Cr in 2.16 moles of  [tex]Cr_2O_3[/tex].

Explanation:

Moles of [tex]Cr_2O_3[/tex] = 2moles

In one molecule of [tex]Cr_2O_3[/tex] there are 2 atoms of Cr.

Then in 1 Mole of  [tex]Cr_2O_3[/tex] contains = 2 moles of Cr

Number of moles of Cr in 2.16 moles of  [tex]Cr_2O_3=2\times 2.16 =4.32 moles[/tex] of Cr.

There are 4.32 moles of Cr in 2.16 moles of  [tex]Cr_2O_3[/tex].

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