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Question
If 1 gram of each of the following gases are taken at STP, which of the gases will occupy (a) greatest volume and (b) smallest volume?
\[\ce{CO, H2O, CH4 , NO}\]
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Solution
Molar volume of a gas is volume occupied by 1 mole of gas at STP (273.15 K and 1 bar pressure) and is equal to 22700 mL.
28 g of \[\ce{CO}\] occupy volume = 227000 mL
∴ 1 g of CO occupies volume = `22700/28` mL at STP
Similarly, 1 g of \[\ce{H2O}\] occupies volume = `22700/18` mL at STP
1 g of \[\ce{CH4}\] occupies volume = `22700/16` mL at STP
1 g of \[\ce{NO}\] occupies volume = `22700/30` mL at STP
(a) \[\ce{CH4}\] occupies greatest volume.
(b) \[\ce{NO}\] occupies smallest volume.
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