Question

какой объем водорода выделиться при реакции 400 мл. 12 % раствора уксусной кислоты p=1,14 г/мл с калием​

Answer 1

Ответ:

Ответ:

Mg + 2CH3COOH = (CH3COO)2Mg + H2

1-----2 моль-------------------------------1моль

m(ук) =0,3*400=120 г

n(ук) = m/Mr=120/60=2 моль

n(Mg)=12/24=0,5 моль

по ур. р-ции на 2 моля СН3СООН требуется 1 моль магния, значит магний в недостатке (0,5 моль) , по нему ведут расчет

n(H2)=n(Mg)

V(H2)=n*Vm=0,5*22,4=11,2 л лови

Объяснение:

Answer 2

Reaction Details

The reaction involves the reaction of 400 ml of a 12% solution of acetic acid (with a density of 1.14 g/ml) with potassium.

Calculating the Volume of Hydrogen Gas

To calculate the volume of hydrogen gas produced, we can use the chemical equation for the reaction and the given information about the solution of acetic acid.

The balanced chemical equation for the reaction between acetic acid and potassium is: ``` CH3COOH + K → CH3COOK + H2 ``` From the equation, we can see that 1 mole of acetic acid reacts with 1 mole of potassium to produce 1 mole of hydrogen gas.

Given that the concentration of the acetic acid solution is 12%, we can calculate the amount of acetic acid in the solution: - 12% solution means 12 g of acetic acid in 100 ml of solution. - The total amount of acetic acid in 400 ml of the solution can be calculated as: 12 g/100 ml * 400 ml = 48 g

Using the molar mass of acetic acid (CH3COOH) which is approximately 60.05 g/mol, we can calculate the number of moles of acetic acid: - Moles of acetic acid = Mass of acetic acid / Molar mass of acetic acid - Moles of acetic acid = 48 g / 60.05 g/mol ≈ 0.799 moles

Since 1 mole of acetic acid produces 1 mole of hydrogen gas, the volume of hydrogen gas produced at standard temperature and pressure (STP) can be calculated using the ideal gas law: - 1 mole of any gas at STP occupies 22.4 liters.

Therefore, the volume of hydrogen gas produced is approximately 0.799 * 22.4 = 17.9 liters.

Conclusion

The volume of hydrogen gas produced in the reaction of 400 ml of a 12% solution of acetic acid with potassium is approximately 17.9 liters at standard temperature and pressure.