Question

Молярная масса эквивалентов металла равна 9 г/моль-эк. Определите объем кислорода (н.у.), необходимый для окисления 15,2 г этого металла. Рассчитайте массовую долю этого металла в его оксиде.

Answer 1

Для решения задачи воспользуемся законом эквивалентов:
m(Me)/Э(Ме) = m(О2)/Э(О2), отсюда
m(O2) = 15,2 * 8/9 = 13,5 г
Находим объем кислорода: (13,5/32) * 22,4 = 9,45 л

Answer 2

Calculation of the Volume of Oxygen Required for Oxidation

To determine the volume of oxygen required for the oxidation of the given metal, we need to use the molar mass of the metal and the stoichiometry of the reaction. The molar mass of the metal is given as 9 g/mol-equivalent.

Since the molar mass of the metal is given in terms of moles of equivalents, we can assume that the metal has a valency of 1. This means that 1 mole of the metal reacts with 1 mole of oxygen.

To calculate the volume of oxygen, we need to convert the mass of the metal to moles using its molar mass. Then, using the stoichiometry of the reaction, we can determine the volume of oxygen.

Let's calculate the volume of oxygen required for the oxidation of 15.2 g of the metal:

1. Calculate the number of moles of the metal: - Number of moles = Mass / Molar mass - Number of moles = 15.2 g / 9 g/mol-equivalent

2. Calculate the volume of oxygen: - Since the stoichiometry of the reaction is 1:1, the number of moles of oxygen required is equal to the number of moles of the metal.

Therefore, the volume of oxygen required for the oxidation of 15.2 g of the metal is equal to the number of moles of the metal.

Please note that the specific identity of the metal is not provided, so we cannot determine the exact volume of oxygen required without additional information.

Calculation of the Mass Fraction of the Metal in its Oxide

To calculate the mass fraction of the metal in its oxide, we need to know the chemical formula of the oxide. Without this information, it is not possible to determine the exact mass fraction.

However, we can provide a general approach to calculating the mass fraction of the metal in its oxide. Let's assume the chemical formula of the oxide is MO, where M represents the metal.

1. Determine the molar mass of the oxide: - The molar mass of the oxide can be calculated by adding the molar masses of the metal and oxygen.

2. Calculate the mass of the metal in the oxide: - The mass of the metal can be calculated by subtracting the molar mass of oxygen from the molar mass of the oxide.

3. Calculate the mass fraction of the metal: - The mass fraction of the metal can be calculated by dividing the mass of the metal by the molar mass of the oxide and multiplying by 100.

Please note that without the specific chemical formula of the oxide, we cannot provide an exact calculation of the mass fraction of the metal.