Question

Прошу помогите пожалуйста очень важно помогите Визначте масу води , в якій потрібно розчинити 140 r калійної селітри щоб приготувати розчин з масовою часткою солі 0,1 потрібно писати з даноі формули​

Answer 1

Ответ:

w(KNO3)=m(KNO3)/m(p-pa) m(p-pa)=m(KNO3)/w(KNO3)=140г/ 0,1=1400г

m(H2O)=1400г-140г=1260г.

Объяснение:

я не знаю правильно это просто я делал

Answer 2

Calculating the Mass of Water Needed to Dissolve 140g of Potassium Nitrate

To determine the mass of water needed to dissolve 140g of potassium nitrate to prepare a solution with a mass fraction of 0.1, we can use the formula for mass fraction:

Mass fraction (w/w) = (mass of solute / total mass of solution) × 100

In this case, the mass fraction (w/w) is 0.1, and the mass of the solute (potassium nitrate) is 140g. We need to find the total mass of the solution and then calculate the mass of water needed.

First, let's calculate the total mass of the solution using the mass fraction formula:

Total mass of solution = mass of solute / mass fraction

Total mass of solution = 140g / 0.1 = 1400g

Now that we know the total mass of the solution, we can calculate the mass of water needed to dissolve the potassium nitrate.

Calculating the Mass of Water

To find the mass of water needed, we subtract the mass of the solute (potassium nitrate) from the total mass of the solution:

Mass of water = Total mass of solution - Mass of solute

Mass of water = 1400g - 140g = 1260g

Therefore, to prepare a solution with a mass fraction of 0.1, you would need to dissolve 140g of potassium nitrate in approximately 1260g of water.

This calculation ensures that the resulting solution will have the desired mass fraction of the solute.

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