Oxygen oxidizes ethyne to carbon dioxide and water as shown by the equation:
2C2H2 + 5O2 → 4CO2 + 2H2O
What is a volume of ethyne gas at STP required to produce 8.4 dm3 of carbon dioxide at STP? [H = 1, C = 12, O = 16]
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Solution
`2C_2H_2 + 5O_2 -> 4CCO_2 + 2H_2O`
2 moles of `C_2H_2` = 4 moles of `CO_2`
`xdm^3` of `C_2H_2` = 8.4 `dm^3` of `CO_2`
x = `(2xx8.4)/4 = 4.2 dm^3` of `C_2H_2`
Concept: Molar Volume of a Gas at S.T.P
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