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Volume of Gases and Number of Moles

2500cc of oxy...

Question

2500cc of oxygen was burnt with 600cc of ethane . Calculate the volume of unused oxygen and the volume of carbon dioxide formed,after writing a balanced equation.

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Solution

2C2H6 + 7O2 ------> 4CO2 + 6H2O +Δ [equation]

Given:

C2H6 used = 600cc

C2H6 O2
2 7 [ratio]
600 x

x = 600 x 7 /2
x = 2100cc [used oxygen]

So unused oxygen = 2500-2100 = 400cc

Volume of CO2 produced:

C2H6 CO2
2 4 [ratio]
600 x

x = 600 x 4 / 2
x = 1200cc

Therefore 1200cc of CO2 is produced

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2500

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[C_{2} H_{6}]

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Methane + Oxygen $\to$ Carbon dioxide + Water vapour

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2500

c m^{3}

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1250

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