Question

A gas cylinder contains 15 moles of 02. How many molecules of oxygen are in the cylinder

Answer 1

The answer is 9.03 × 10²⁴ molecules of oxygen!

• Step 1  6.02 × 10²³ molecules : 1 mol = x : 15 mol
• Step 2  x = 6.02 × 10²³ molecules * 15 mol * 1 mol
• Step 3 x = 90.3 × 10²³ molecules
• Step 4  x = 9.03 × 10 × 10²³ molecules
• Step 5  x = 9.03 × 10²³⁺¹ molecules
• Step 6  { x = 9.03 × 10²⁴ molecules }