Question

11. (3 бали) Задача. У якому з оксидів масова частка Хрому більше: Хром(ІІ) чи оксиді Хром(ІІІ) оксиді? срочно​

Answer 1

W(CrO)=52/68=0,76=76%

W(Cr2O3)=2*52/152=0,68=68%

Масова частка Хрому більше в сполуці Хром(ІІ) оксиді - CrO

Answer 2

Determining the Oxide with a Higher Mass Fraction of Chromium

To determine in which oxide the mass fraction of chromium is higher, we need to compare the mass fractions of chromium in Chromium(II) oxide and Chromium(III) oxide.

Chromium(II) Oxide (CrO): - The molar mass of chromium is 51.996 g/mol, and the molar mass of oxygen is 15.999 g/mol. - The molar mass of Chromium(II) oxide is 67.995 g/mol. - Chromium contributes 51.996 g/mol to the molar mass of Chromium(II) oxide.

Chromium(III) Oxide (Cr2O3): - The molar mass of chromium is 51.996 g/mol, and the molar mass of oxygen is 15.999 g/mol. - The molar mass of Chromium(III) oxide is 151.998 g/mol. - Chromium contributes 2 * 51.996 g/mol to the molar mass of Chromium(III) oxide.

Calculating the Mass Fraction of Chromium

To calculate the mass fraction of chromium in each oxide, we can use the following formula:

Mass Fraction = (Mass of Chromium in the Compound / Molar Mass of the Compound) * 100%

Chromium(II) Oxide: - Mass Fraction of Chromium = (51.996 g/mol / 67.995 g/mol) * 100% = 76.46%

Chromium(III) Oxide: - Mass Fraction of Chromium = (2 * 51.996 g/mol / 151.998 g/mol) * 100% = 68.18%

Conclusion

Based on the calculations, the mass fraction of chromium is higher in Chromium(II) Oxide (CrO) with a mass fraction of approximately 76.46%, compared to Chromium(III) Oxide (Cr2O3) with a mass fraction of approximately 68.18%.