Answer :

Final answer:

The identity of the acid in a solution with 75.0% concentration by mass and a density of 1.57 g/mL can be deduced by calculating the molarity and molar mass and comparing it to known molar masses of acids.

Explanation:

The question is attempting to determine the identity of the acid based on its concentration, density, and mass percentage. To find the identity, we can calculate the molarity of the acid using the given density and percentage by mass and compare it to known acids or use additional properties such as molecular weight.

Let's analyze the given data:

The acid solution has a concentration of 75.0% by mass.

The density of the solution is 1.57 g/mL.

To find the molar mass of the acid, we can use the formula:

Molar Mass = (mass of solute / volume of solution) / molarity

This molar mass can then be compared against known acids to infer the identity of the solution. However, since the molarity is not given, another step would be to calculate the molarity from the mass percent and density of the solution, and then find the molar mass.

Please note that for an accurate determination of the acid's identity, other methods like spectroscopic analysis or further chemical testing would typically be used in addition to these calculations.

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Rewritten by : Barada