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Question

What volume of ethyne gas at s.t.p. is required to produce 8.4 dm3 of carbon dioxide at s.t.p.?
2C2H2 + 5O2 ⟶ 4CO2 + 2H2O
[H = 1, C = 12, O = 16]

Percentage Composition

Chemistry, Class 10, ICSE, J Dalal

August 2, 2024

Answer

[By Lussac’s law]

2C₂H₂	+	5O₂	→	4CO₂	+	2H₂O
2 vol	:	5 vol		4 vol	:	2 vol

To calculate the volume of ethyne gas

CO2	:	C2H2
4	:	2
8.4	:	x

⇒ x = $2\over 4$ × 8.4 = 4.2 dm³

Hence, volume of ethyne gas required = 4.2 dm³.

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