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Q.

What is the molecular mass of KMnO₄ in grams?

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answer is 158.

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Detailed Solution

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The molecular mass of KMnO₄ is 158 g.
Mass of Mn = 55 g
Mass of potassium = 39 g
Mass of oxygen = 16 g

So, the mass of KMnO₄= $39 + 55 + 16 \times 4$
$\Rightarrow$ $39 + 55 + 64$

$\Rightarrow 158 g$

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