First slide

Gaseous state

Question

O₂ gas at STP contained in a flask was replaced by SO₂ under same conditions. The weight of SO₂ will be

Moderate

A

equal to that of O₂
B

half that of O₂
C

twice that of O₂
D

one-fourth of O₂

Solution

Number of moles remains unchanged. One mole SO₂replaces one mole of O₂ hence
$32 g O_{2} = 64 g {SO}_{2}$

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