Natto is a diet food, from which an organic substance A composed of three elements, C, H and O, is separated. In order to determine its structure, the following experiments were carried out:

(1) according to ①, n (CO2) = 3.36l22.4l/mol = 0.15mol, n (H2O) =1.8g1mol = 0.1. 0. 15mol× 12g/mol？ 0.2mol× 1g/mol 16g/mol = 0.25mol，

Then the atomic number ratio of C, H and O is 0.15mol: 0.2mol: 0.25mol = 3: 4: 5, and the simplest molecular formula is C3H4O5.

Combining ② and ③, it can be seen that the ethanol is 0.92g46g/mol=0.02mol, and the reaction between A and ethanol is 1: 2, that is, there are two -cooh in A, then m = 0.24g0.002mol =120g/mol, 12x3+4.

A: The molar mass of A is 120g/mol, and the chemical formula is C3H4O5；;

(3) According to ③, A reacts with Na to generate hydrogen, and the hydrogen is 0.336l22.4l/mol = 0.015mol, then A contains 3 -OH and 2 -COOH, and the structural formula is,

A: The short structure of A is.

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