Question

Oxygen oxidizes ethyne to carbon dioxide and water as shown by the equation :  2C2H2 + 5O2 ----> 4CO2 +2H2O  What volume of ethyne gas at S.T.P. is required to produce 8.4 dm3 of carbon dioxide at S.T.P. ? [H = 1, C = 12, O = 16]oxygen-oxidizes-ethyne-carbon-dioxide-and-water-shown-by-the-equation-2c2h2-5o2-4co2-2h2o

please don't solve it by unitary method but it by other methods ..like ​

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