What is the mass of potassium in a sample of KClO4 that contains 5.62 g of oxygen?

12.2 g

Explanation:

Step 1: Given data

Mass of O in KClO₄: 5.62 g

Step 2: Calculate the moles corresponding to 5.62 g of O

The molar mass of O is 16.00 g/mol.

5.62 g × (1 mol/16.00 g) = 0.351 mol

Step 3: Calculate the moles of KClO₄ that contain 0.351 moles of O

The molar ratio of KClO₄ to O is 1:4. The moles of KClO₄ that contain 0.351 mol of O are 1/4 × 0.351 mol = 0.0878 mol

Step 4: Calculate the mass corresponding to 0.0878 moles of KClO₄

The molar mass of KClO₄ is 138.55 g/mol.

0.0878 mol × (138.55 g/mol) = 12.2 g

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.