Question

A student weighed out exactly 7.90 grams of potassium permanganate (KMnO4), in a beaker. she has how many moles of potassium permanganate?

Answer 1

Answer on Question #48774, Chemistry, Other

**Task:**

A student weighed out exactly 7.90 grams of potassium permanganate (KMnO₄), in a beaker. How many moles of potassium permanganate she has?

**Answer:**

$$\nu = \frac{m}{M}$$ $$M \left(KMnO_4\right) = 158 \text{ g/mol}$$ $$\nu \left(KMnO_4\right) = \frac{7,90}{158} = 0,05 \text{ mol}$$

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