Arrange the following substances in order of their increasing volumes at STP.
(i) $1 g$ of ${C O}_{2}$ ; (ii) $1 g$ of ${C l}_{2}$ , (iii) $1 g$ of methane ${C H}_{4}$ and (iv) $1 g$ of $H e$
(Atomic weight of $C = 12, O = 16, H = 1, C l = 35.5$ and $H e = 4$ g/mole)

(i), (ii), (iii) and (iv)

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(iv), (iii), (ii) and (i)

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(ii), (i), (iii) and (iv)

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(iv), (ii), (i) and (iii)

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Solution

The correct option is B (ii), (i), (iii) and (iv)
Mass is divided with molar mass and multiplied with molar volume ( $22.4$ L at STP) to obtain volume.
At STP
(i) The volume of 1 g of $C O_{2} = 1 \times \frac{22.4}{44} = 0.509$ litres

(ii) The volume of 1 g of $C l_{2} = 1 \times \frac{22.4}{71} = 0.315$ litres

(iii) The volume of 1 g of $C H_{4} = 1 \times \frac{22.4}{16} = 1.4$ litres

(iv) The volume of 1 g of $H e$ $= 1 \times \frac{22.4}{4} = 5.6$ litres.

Hence the order of their increasing volume is (ii), (i), (iii), (iv).
Note: Volume of a fixed mass of gas is inversely proportional to molecular weight. Higher is the molecular weight of a gas, lower will be the volume.

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Arrange the following substances in order of their increasing volumes at STP.(i) 1g of CO2; (ii) 1g of Cl2, (iii) 1g of methane CH4 and (iv) 1g of He (Atomic weight of C=12,O=16,H=1,Cl=35.5 and He=4 g/mole)

Arrange the following substances in order of their increasing volumes at STP.
(i) $1 g$ of ${C O}_{2}$ ; (ii) $1 g$ of ${C l}_{2}$ , (iii) $1 g$ of methane ${C H}_{4}$ and (iv) $1 g$ of $H e$
(Atomic weight of $C = 12, O = 16, H = 1, C l = 35.5$ and $H e = 4$ g/mole)