Question

К 100г 10% раствора добавили 200 г 20% раствора . Какая массовая доля раствор вещества?

Answer 1

W3= массав-ва1 +масса в-ва2/ масса р-ра1 +масса в-ва2 ;
1)масса в-ва1= w1*mp-pa1/100%= 100*01= 10г
2) m в-ва2=200*0,2=40г
3)w3= 10+40/100+200=0.1667 или 16,67%

Answer 2

Calculating the Mass Fraction of the Solution

To calculate the mass fraction of the resulting solution after mixing 100g of a 10% solution with 200g of a 20% solution, we can use the following formula:

Mass Fraction = (Mass of solute / Total mass of solution) * 100%

First, let's calculate the mass of the solute in each solution:

For the 10% solution: Mass of solute = 10% of 100g = 10g

For the 20% solution: Mass of solute = 20% of 200g = 40g

Now, let's calculate the total mass of the resulting solution: Total mass = 100g + 200g = 300g

Using the formula, we can calculate the mass fraction of the resulting solution:

Mass Fraction = ((10g + 40g) / 300g) * 100% Mass Fraction = (50g / 300g) * 100% Mass Fraction ≈ 16.67%

So, the mass fraction of the resulting solution is approximately 16.67%.