Question

Оценить массу и размер молекул воды, зная ее плотность и молярную массу.

Answer 1

молярную массу делишь на количество молекул в моле (6*10^23) - получаешь массу одной молекулы

объём, занимаемый однм молем (22.4 литра) делим на колечество молекул в моле - получаем объём одной молекулы. Считая молекулу кубиком, находим сторону куба, извлекая корень третьей степени

Answer 2

Calculating the Size and Mass of Water Molecules

To calculate the mass and size of water molecules, we can use the given information about the density and molar mass of water.

Density of Water: The density of water is approximately 1 g/cm³ or 1000 kg/m³.

Molar Mass of Water: The molar mass of water (H2O) is approximately 18.01528 g/mol.

Calculating the Mass of Water Molecules

The mass of water molecules can be calculated using the formula: m = ρV Where: - m = mass - ρ = density - V = volume

Given that the density of water is approximately 1000 kg/m³ and the molar mass of water is approximately 18.01528 g/mol, we can calculate the mass of water molecules.

Using the formula, we can calculate the mass of one water molecule: m = ρV = ρ(n/V) = ρ(1/Nₐ) Where: - Nₐ = Avogadro's number (6.022 x 10^23 mol⁻¹)

Substituting the values: m = 1000 kg/m³ * (1/6.022 x 10^23 mol⁻¹)

Calculating the Size of Water Molecules

The size of water molecules can be calculated using the formula: V = m/ρ Where: - V = volume - m = mass - ρ = density

Given the mass of one water molecule, we can calculate its volume using the formula.

Substituting the values: V = m/ρ = (1/6.022 x 10^23 mol⁻¹) / 1000 kg/m³

This calculation will provide the volume of one water molecule.

These calculations will provide us with the mass and size of water molecules based on the given density and molar mass of water.