What is the combined percentage of nitrogen and oxygen in dry air?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

What is the combined percentage of nitrogen and oxygen in dry air?

Explanation:
Dry air is dominated by two gases: nitrogen and oxygen. In the atmosphere, nitrogen makes up about 78% and oxygen about 21%. When you add these together, you get roughly 99% of dry air. The remaining ~1% comes from trace gases like argon, carbon dioxide, neon, and others. So the best answer is the one that states about 99%. The other numbers correspond to just nitrogen (around 78%), just oxygen (around 21%), or the small amount of trace gases, not their sum.

Dry air is dominated by two gases: nitrogen and oxygen. In the atmosphere, nitrogen makes up about 78% and oxygen about 21%. When you add these together, you get roughly 99% of dry air. The remaining ~1% comes from trace gases like argon, carbon dioxide, neon, and others. So the best answer is the one that states about 99%. The other numbers correspond to just nitrogen (around 78%), just oxygen (around 21%), or the small amount of trace gases, not their sum.

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