Вычислите относительную молекулярную массу фосфористой кислоты.

  1. 98
  2. 68
  3. 80
  4. 78

📝 Detailed explanation

H₃PO₃: Mr = 3·1 + 31 + 3·16 = 82. Ближайшее значение в вариантах — 80.
12 / 84 (14%)
Question 12 of 84
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