IOM 2018, Блиц, английски — Задача 30

OLYMPIAD OF METROPOLISES. Moscow, September 3 · 3 септември 2018 г.

Условие

100 ml of 30% perchloric acid solution (ρ=1.11\rho = 1.11 g/mL) and 300 ml of 20% sodium hydroxide solution (ρ=1.10\rho = 1.10 g/mL) were mixed. How many milliliters of water should be added to this mixture, so that the mass fraction of sodium hydroxide in the resulting solution be 11%? Take Ar(Cl)=35.5A_r(Cl) = 35.5.

  1. 11.2 2) 38.5 3) 123 4) 159

Отговори

Решение

Оригинал в Архива: blitz.pdf · официални решения: blitz-answers.pdf