Answer to Question #171327 in Chemistry for Kinsey

Question

75g KMnO4=. Molecules KMnO4

Answer 1

Solution:

Moles of KMnO₄ = Mass of KMnO₄ / Molar mass of KMnO₄

The molar mass of KMnO₄ is 158.034 g mol^-1.

Hence,

Moles of KMnO₄ = (75 g) / (158.034 g mol^-1) = 0.4746 mol KMnO₄

One mole of any substance contains 6.022×10²³ atoms/molecules.

Hence,

Number of KMnO₄ molecules = (0.4746 mol) × (6.022×10²³ molecules / 1 mol) = 2.858×10²³ molecules

Number of KMnO₄ molecules = 2.858×10²³ molecules

Answer: 2.858×10²³ KMnO₄ molecules.