Question

Determine the number of formula units of Cr(ClO2)3 and moles of Oxygen contained in 6.85 moles of Cr(ClO2)3

Answer 1

The formula  units  of Cr(ClO2)3  that  are in 6.85  moles of Cr(Clo203  is  4.1237 x10^24  formula units

 calculation

  the formula units are  calculated using of Avogadro's  law  constant

that is   according  to Avogadro's law   1  mole = 6.02 x10 ^23  formula units

                                                             6.85 moles= ?  formula units

by  cross  multiplication.

 = ( 6.85 moles   x 6.02  x10^23  formula units )  / 1 mole  = 4.1237  x 10 ^24  formula units

The moles of  Oxygen  contained  in 6.85  moles of cr(ClO2)3  is    41.1  moles

 calculation

moles   of  oxygen = number of oxygen atom in  Cr(ClO2)3  x   6.85(moles of  Cr(ClO2)3

calculate the number of   oxygen atoms that  are in Cr(ClO2)3

that is  2 x 3 = 6 atoms of Oxygen.

moles is therefore =  6  x 6.85 moles= 41.1 moles