SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Oxygen
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Hydrogen
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Carbon monoxide
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Nitrogen
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Detailed explanation-1: -It’s a mixture of different gases. The air in Earth’s atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of other gases, too, such as carbon dioxide, neon, and hydrogen.
Detailed explanation-2: -The major components of air are O2 and N2 with approximate proportion of 21% and 79% by volume at 298 K.
Detailed explanation-3: -Air contains 23% of oxygen and 77%of nitrogen by weight.
Detailed explanation-4: -Components in Dry Air Oxygen has a molar mass of 15.9994 g/mol and nitrogen has a molar mass of 14.0067 g/mol. Since both of these elements are diatomic in air-O2 and N2, the molar mass of oxygen gas is 32 g/mol and the molar mass of nitrogen gas is 28 g/mol. The molar mass of dry air is 28.9647 g/mol.