Question

Определите число формульных единиц и массу негашеной извести CaO химическим количеством 5 моль.

Answer 1

M(CaO)=n *M=5моль *56г\моль =280г

Answer 2

Calculating the Number of Formula Units and the Mass of Unreacted Lime (CaO)

To determine the number of formula units and the mass of unreacted lime (CaO) with a chemical quantity of 5 moles, we can use the molar mass of CaO and the given quantity to calculate these values.

Number of Formula Units: The number of formula units can be calculated using Avogadro's number, which states that one mole of any substance contains 6.022 x 10^23 formula units.

The molar mass of CaO is approximately 56.08 g/mol.

Using the given chemical quantity of 5 moles, we can calculate the number of formula units: Number of formula units = 5 moles * 6.022 x 10^23 formula units/mole

Mass of Unreacted Lime (CaO): The mass of unreacted lime (CaO) can be calculated using the molar mass and the given quantity.

Mass = Chemical quantity * Molar mass Mass = 5 moles * 56.08 g/mol

Therefore, the number of formula units of CaO with a chemical quantity of 5 moles is approximately 3.011 x 10^24 formula units, and the mass of unreacted lime (CaO) is approximately 280.4 grams.