Question

К 130 г 20 процентного раствора нитрата калия добавили 30 г воды Рассчитайте массовую долю соли в полученном растворе. СРОЧНО!!!!!​

Answer 1

Відповідь:

m(соли)=130*20/100=26г

m2(р-ра)=130+30=160г

w=26*100/160=16,25%

Пояснення:

Answer 2

Calculation of Mass Fraction of Salt in the Solution

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

Given: - Initial mass of the 20% potassium nitrate solution: 130 g - Mass of water added: 30 g

To find the mass of the salt, we can subtract the mass of water added from the initial mass of the solution:

Mass of salt = Initial mass of solution - Mass of water added

Mass of salt = 130 g - 30 g = 100 g

Now, to calculate the mass fraction of salt in the solution, we divide the mass of the salt by the total mass of the solution and multiply by 100:

Mass fraction of salt = (Mass of salt / Total mass of solution) * 100

Mass fraction of salt = (100 g / 160 g) * 100 = 62.5%

Therefore, the mass fraction of salt in the resulting solution is 62.5%.

Please note that the sources provided did not contain specific information related to the calculation. However, the calculation is based on the principles of mass conservation and the definition of mass fraction.