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chem mcq questions

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ayesha.:
can anyone explain why the answer to q1 in o/n/02 is c?

CHEMMASTER6000:
im using the formulae CxHy+ (x+y/4)O2 = xCO2 + Y/2H20

so in this case only CxHy = xCO2 is viable

methane is 1 c and ethane is 2 carbon. there fore CO2 must = 3 moles overall.

10 cm cube methane gives 10 cube  co2
10cm cue ethane gives 20 cm cube c02

total =30 cm cube

CHEMMASTER6000:
hope that helps ;D

aldehyde:
1 mole of ch4=1 mole of co2= 10 cm3 of gas
1 mole of c2h5=2 mole of co2=20cm3 of gas
                                             ----------------
total volume of residual gas=20+10=30 cm3

aldehyde:
ooops i was a bit late anyway the first answer is better

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