IOM 2016, Блиц — Задача 76

Olympiad of Metropolises, Moscow. Blitz Contest, September, 5 · 5 септември 2016 г.

Условие

A box contains 501 pieces of identical coins. Each coin weighs 4.13 grams and is composed of gold and silver. We dissolve one of the coins in 12.6 g of 50% (in mass fraction) nitric acid and observe liberation of a brown gas. 0.06 moles of nitric acid remains after the reaction is complete. How many rubles does the box cost in total after the experiment if 1 mol of gold costs 5 rubles and 1 mol of silver costs 2 rubles? Give the integer value.

Решение

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Оригинал в Архива: blitz.pdf