Question

Рассчитайте объём хлороводорода, который потребуется для приготовления 30% раствора массой 500г Надеюсь на вашу помощь, ибо с химией никак.

Answer 1

Пусть х г - масса H2S
х/500=0.3
х=150
n(H2S)=m/M=150 г / 34 г/моль =4,412 моль
V=Vm*n=22.4*4.412=98.9288 л≈99 л

Answer 2

Calculating the Volume of Hydrochloric Acid Needed

To calculate the volume of hydrochloric acid needed to prepare a 30% solution by mass, we can use the formula:

% concentration = (mass of solute / mass of solution) * 100

Given: - % concentration = 30% - mass of solution = 500g

We can rearrange the formula to solve for the mass of solute (hydrochloric acid) and then convert it to volume using the density of hydrochloric acid.

First, let's calculate the mass of hydrochloric acid needed.

Step 1: Calculate the mass of hydrochloric acid Using the formula: mass of solute = % concentration * mass of solution / 100

Substitute the given values: mass of solute = 30% * 500g / 100

Calculating: mass of solute = 0.3 * 500g = 150g

Now, we need to convert the mass of hydrochloric acid to volume using its density.

Converting Mass to Volume Using Density

The density of hydrochloric acid is approximately 1.2 g/mL.

Step 2: Calculate the volume of hydrochloric acid Using the formula: volume = mass / density

Substitute the given values: volume = 150g / 1.2 g/mL

Calculating: volume ≈ 125mL

Therefore, approximately 125 milliliters of hydrochloric acid will be needed to prepare a 30% solution by mass with a total mass of 500 grams.

I hope this helps! If you have any further questions or need clarification, feel free to ask.