Question

Определите молярную концентрацию раствора карбонатной кислоты с массовой долей вещества 47,7% и плотностью 1,315 г/см 3 . ПОМОГИТЕЕЕ

Answer 1

Ответ:

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Answer 2

Calculation of Molar Concentration of Carbonic Acid Solution

To determine the molar concentration of a solution of carbonic acid, we need to know the mass fraction of the substance and the density of the solution. In this case, the mass fraction of carbonic acid is given as 47.7% and the density is 1.315 g/cm³.

The molar concentration (C) of a solution is defined as the number of moles of solute per liter of solution. It can be calculated using the formula:

C = (mass fraction / molar mass) / (density / 1000)

Let's calculate the molar concentration of the carbonic acid solution using the given values:

1. Calculate the molar mass of carbonic acid (H₂CO₃): - The molar mass of carbon (C) is 12.01 g/mol. - The molar mass of hydrogen (H) is 1.01 g/mol. - The molar mass of oxygen (O) is 16.00 g/mol. - The molar mass of carbonic acid (H₂CO₃) can be calculated as follows: Molar mass of H₂CO₃ = (2 * molar mass of H) + molar mass of C + (3 * molar mass of O)

2. Calculate the molar concentration (C) using the formula mentioned above.

Let's perform the calculations step by step:

Calculation Steps:

1. Calculate the molar mass of carbonic acid (H₂CO₃): - Molar mass of H₂CO₃ = (2 * 1.01 g/mol) + 12.01 g/mol + (3 * 16.00 g/mol) - Molar mass of H₂CO₃ = 62.03 g/mol

2. Calculate the molar concentration (C) using the formula: - C = (mass fraction / molar mass) / (density / 1000) - C = (47.7% / 62.03 g/mol) / (1.315 g/cm³ / 1000)

Now, let's substitute the values and calculate the molar concentration:

C = (0.477 / 62.03) / (1.315 / 1000)

C = 0.0077 mol/L

Answer:

The molar concentration of the carbonic acid solution with a mass fraction of 47.7% and a density of 1.315 g/cm³ is approximately 0.0077 mol/L.

Please note that the calculation assumes that the carbonic acid is the only solute in the solution and that the solution behaves ideally.