Речовина утворена двома елементами X і Y. В ядрі атома елемента X міститься 29 протонів, елемента Y - 17. Складіть формулу цієї речовини. У якій кількості цієї речовини міститься 4, 5 моль елемента Y? У якій кількості цієї речовини міститься 0, 7 моль елемента Y?

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Объяснение:

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