# Calculate the mass of oxygen that can be obtained from potassium permanganate weighing 7.9 g.

August 30, 2021 | education

| To solve, we compose the equation:

1. 2KMnO4 = K2MnO4 + MnO2 + O2 – decomposition, oxygen was obtained by laboratory method;

2. Calculations:

M (KMnO4) = 158 g / mol.

M (O2) = 32 g / mol.

3. Determine the Y (amount) of the original substance:

Y (KMnO4) = m / M = 7.9 / 158 = 0.05 mol.

4. Proportion:

0.05 mol (KMnO4) – X mol (O2);

-2 mol -1 mol from here, X mol (O2) = 0.05 * 1/2 = 0.025 mol.

5. Find the mass of the product:

m (O2) = Y * M = 0.025 * 32 = 0.8 g.

Answer: oxygen with a mass of 0.8 g was formed.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.