[blackblack]

Hi, I've got a problem regarding concentration of solutions.

The question is "Concentrated phosporic acid contains 85% H₃PO₄ by mass and has a density of 1.69 g/mL. Assuming 1000 mL solution, calculate"

a. mass of solute
    = I just followed the formula, % mass = mass(solute)/mass(solution) x 100, and I got 1436.5 g

b. molality
     = following molality's formula, I got 57.71 mol/kg.

c. molarity
      =following its formula, I got 14.66 mol/L.

d. Normality
     = following its formula, I got 43.98

My question is, did I get it right? If not, where did I go wrong? Any responses are appreciated. Thanks!

Sorry for the format since I'm using mobile to post this.

[AWK]

where did I go wrong?

Why do you think so?
After all, each calculation can be checked to start from the final result and calculating the percentage concentration from it.

[Borek]

b. molality
     = following molality's formula, I got 57.71 mol/kg.

I got slightly different value, can you post your calculations?

[AWK]

0.2 % error - may be neglected.

[Borek]

0.2 % error - may be neglected.

Depends on who checks the results

As I wrote - "slightly". But often checking what has happened is a learning moment.