What percentage of argon is present 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 percentage of argon is present in dry air?

Explanation:
Air is a mixture with mostly two gases: nitrogen and oxygen, and a small amount of other gases. Argon is one of these trace gases and in dry air it makes up about 0.9% by volume. The big two account for about 78% and 21% of the air, respectively, leaving roughly 1% for all the other gases combined—argon being one of the main contributors in that tiny remainder. So, the value that matches this typical proportion is 0.9%. The other numbers correspond to nitrogen (78%), oxygen (21%), or carbon dioxide (about 0.04%), not argon.

Air is a mixture with mostly two gases: nitrogen and oxygen, and a small amount of other gases. Argon is one of these trace gases and in dry air it makes up about 0.9% by volume. The big two account for about 78% and 21% of the air, respectively, leaving roughly 1% for all the other gases combined—argon being one of the main contributors in that tiny remainder. So, the value that matches this typical proportion is 0.9%. The other numbers correspond to nitrogen (78%), oxygen (21%), or carbon dioxide (about 0.04%), not argon.

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