Question

what percentage of the air is: - oxygen? 21 % - argon? 0.9 % - carbon dioxide, water, etc? % - what is the rest (78% of it)?

Explanation:

Step1: Recall total percentage of air components

The total percentage of all components in air should be 100%. We know the percentages of oxygen (21%), argon (0.9%), and the rest (which is nitrogen, 78%).

Step2: Calculate percentage of CO₂, water, etc.

Let \( x \) be the percentage of carbon dioxide, water, etc. Then we have the equation: \( 21 + 0.9 + 78 + x = 100 \). First, sum the known percentages: \( 21 + 0.9 + 78 = 99.9 \). Then, solve for \( x \): \( x = 100 - 99.9 = 0.1 \). Also, the "rest" (nitrogen) is given as 78%, so we confirm that.

Answer:

• Carbon Dioxide, Water, etc.: \( 0.1 \) %
• What is the rest (78% of it): Nitrogen (since the rest of the air, 78%, is nitrogen)