What is the volume occupied by 4 grams of ethylene at $S T P$ (in litres)?

22.4

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11.2

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5.6

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3.2

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Solution

The correct option is A 3.2
The molar mass of ethylene( $C_{2} H_{4}$ ) is 28 $g / m o l$ .

Thus, 4 grams of ethylene corresponds to $0.143$ moles.

At STP, one mole occupies 22.4 $L$ .

Thus, 0.143 moles will occupy $22.4 \times 0.143 = 3.2 L$ .

Hence, the correct answer is option $D$ .

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