Question

Металл массой 2,000 г вытесняет 1,132 г меди из рас-твора ее соли. Массовая доля кислорода в оксиде меди состав-ляет 20 %. Определите молярную массу эквивалентов этого ме-талла.

Answer 1

В оксидах O 2-хвал-н и его M экв. = 16/2 = 8 г/моль;

т.о. M экв. меди в оксиде = (100-20)/(20/8) = 32 г/моль;

по з. экв-в, M экв. металла = 2*(32/1.132) = 56.54 г/моль.

Answer 2

Given Information:

- Mass of metal = 2,000 g - Mass of displaced copper = 1,132 g - Mass fraction of oxygen in copper oxide = 20%

Calculating the Molar Mass of the Metal:

To determine the molar mass of the metal, we need to use the concept of equivalent mass. The equivalent mass of a substance is the mass of the substance that reacts with or replaces one mole of hydrogen ions (H+) or donates or accepts one mole of electrons.

In this case, the metal is displacing copper from its salt, so we can use the equation:

Metal + Copper Salt → Metal Salt + Copper

From the given information, we know that the mass of the metal is 2,000 g and the mass of the displaced copper is 1,132 g. To find the molar mass of the metal, we need to calculate the number of moles of copper displaced and then use the stoichiometry of the reaction to determine the number of moles of metal.

1. Calculate the number of moles of copper displaced: - The molar mass of copper (Cu) is approximately 63.55 g/mol. - Number of moles of copper = mass of copper / molar mass of copper - Number of moles of copper = 1,132 g / 63.55 g/mol

2. Use the stoichiometry of the reaction to determine the number of moles of metal: - The balanced equation for the reaction is not provided, so we cannot determine the stoichiometry of the reaction directly. - However, we can assume that the reaction is a 1:1 ratio between the metal and copper. This means that one mole of metal displaces one mole of copper. - Therefore, the number of moles of metal is equal to the number of moles of copper displaced.

3. Calculate the molar mass of the metal: - Molar mass of the metal = mass of metal / number of moles of metal - Molar mass of the metal = 2,000 g / (1,132 g / 63.55 g/mol)

Let's calculate the molar mass of the metal using the given information:

Metal + Copper Salt → Metal Salt + Copper

1. Number of moles of copper displaced: - Number of moles of copper = 1,132 g / 63.55 g/mol

2. Number of moles of metal = Number of moles of copper displaced

3. Molar mass of the metal = 2,000 g / (1,132 g / 63.55 g/mol)

Calculation:

1. Number of moles of copper displaced: - Number of moles of copper = 1,132 g / 63.55 g/mol - Number of moles of copper = 17.8 mol

2. Number of moles of metal = Number of moles of copper displaced - Number of moles of metal = 17.8 mol

3. Molar mass of the metal = 2,000 g / (1,132 g / 63.55 g/mol) - Molar mass of the metal = 112.1 g/mol

Answer:

The molar mass of the metal is approximately 112.1 g/mol.