Question

Вычислите масовые доли кисларода в следуших элементах Cao

Answer 1

M(CaO) = 56;
M(O) = 16;
W(O) = (16/56)*100 = 28.57%

Answer 2

Calculating the Mass Fractions of Oxygen in CaO

To calculate the mass fractions of oxygen in CaO, we can use the molar masses of the elements involved and apply the appropriate stoichiometry.

The molar mass of CaO (calcium oxide) is 56 g/mol, and the molar mass of oxygen is 16 g/mol.

Using the molar masses, we can calculate the mass fraction of oxygen in CaO.

The mass fraction of oxygen in CaO can be calculated using the following formula: Mass fraction of oxygen = (Molar mass of oxygen / Molar mass of CaO) * 100%

Substituting the values: Mass fraction of oxygen = (16 / 56) * 100%

Calculating the mass fraction: Mass fraction of oxygen = (0.2857) * 100% = 28.57%

Therefore, the mass fraction of oxygen in CaO is approximately 28.57%.