Question

Муравьиную кислоту химический кол-вом 0.25 моль растворили в воде массой 17.25 г . Расчитать массовую долю кислоты в растворе

Answer 1

M(HCOOH)=46 г/моль

расчитываем массу кислоты 0,25*46=11,5г

расчитываем массу раствора 17,25+11,5=28,75г

рассчитываем массовую долю 11,5/28,75=0,4 (40%)

 

 

 

 

 

 

Answer 2

Calculation of the Mass Fraction of Formic Acid in the Solution

To calculate the mass fraction of formic acid in the solution, we need to determine the mass of formic acid and the total mass of the solution.

Given: - Chemical amount of formic acid (HCOOH) = 0.25 mol - Mass of water (H2O) = 17.25 g

To calculate the mass of formic acid, we can use the molar mass of formic acid, which is 46.03 g/mol.

The molar mass of formic acid (HCOOH) is calculated as follows: - Atomic mass of hydrogen (H) = 1.01 g/mol - Atomic mass of carbon (C) = 12.01 g/mol - Atomic mass of oxygen (O) = 16.00 g/mol

Molar mass of formic acid (HCOOH) = (1 * 1.01) + (1 * 12.01) + (2 * 16.00) = 46.03 g/mol

The mass of formic acid can be calculated using the formula: Mass of formic acid = Chemical amount of formic acid * Molar mass of formic acid

Mass of formic acid = 0.25 mol * 46.03 g/mol = 11.5075 g

The total mass of the solution is the sum of the mass of formic acid and the mass of water: Total mass of the solution = Mass of formic acid + Mass of water

Total mass of the solution = 11.5075 g + 17.25 g = 28.7575 g

The mass fraction of formic acid in the solution can be calculated using the formula: Mass fraction of formic acid = (Mass of formic acid / Total mass of the solution) * 100%

Mass fraction of formic acid = (11.5075 g / 28.7575 g) * 100% ≈ 39.99%

Therefore, the mass fraction of formic acid in the solution is approximately 39.99%.

Please note that the calculated mass fraction is an approximation due to rounding off the values during calculations.

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