Lesson eLearning

What is the percentage of nitrogen in dry air by mass?

easy MCQ 1 mark Class 7 · Geography · Air
  1. 70%
  2. 78%
  3. 79%
  4. 80%
Answer
78%

The correct answer is 78% — Thus the correct choice is 78%.

Step-by-step solution

  1. Dry air is mainly nitrogen, oxygen, argon and carbon dioxide.
  2. The mass percentage of nitrogen in dry air is about 78%.
  3. Thus the correct choice is 78%.
Common mistake: Confusing mass percentage with volume percentage

Concept tested: Composition of air

Published · How this solution was prepared and checked

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