Which gas is the third most abundant 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

Which gas is the third most abundant in dry air?

Explanation:
Knowing how dry air is composed by volume helps identify the relative amounts of its gases. In dry air, nitrogen is the most abundant, followed by oxygen. The next most plentiful gas is argon, a noble gas, making up about 0.9% of the air. Carbon dioxide is present only about 0.04%, and neon is present in trace amounts far less than argon. So argon is the third most abundant gas in dry air, which is why it’s the best answer.

Knowing how dry air is composed by volume helps identify the relative amounts of its gases. In dry air, nitrogen is the most abundant, followed by oxygen. The next most plentiful gas is argon, a noble gas, making up about 0.9% of the air. Carbon dioxide is present only about 0.04%, and neon is present in trace amounts far less than argon. So argon is the third most abundant gas in dry air, which is why it’s the best answer.

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