Given the reaction
2C2H6(g)+7O2(g)4CO2(g)+6H2O(g)

At STP, what is the total volume of Co2(g) formed when 6.0 liters of C2H6(g) is completely oxidized?

Question

Given the reaction
2C2H6(g)+7O2(g)>>>4CO2(g)+6H2O(g)

At STP, what is the total volume of Co2(g) formed when 6.0 liters of C2H6(g) is completely oxidized?

dtan5457 · Answer

@aaronq

dtan5457 · Answer

2 moles of c2h6 is 44.8 liters, so you would divide by 7.46 to get 6 liters...

so 4 moles of co2 is 89.6 liters, divided by 7.46=roughly 12 liters?

apparently that's the wrong answer, however..

aaronq · Answer

I was going to say dont worry about scaling down, you can treat the volume just like moles

$\sf \dfrac{V_{ethane}}{2}=\dfrac{V_{CO_2}}{4}\rightarrow  \dfrac{6~L}{2}=\dfrac{V_{CO_2}}{4}$

$\sf V_{CO_2}=12~L$

I got the same answer though

dtan5457 · Answer

the regents says it's 4 liters, but based on the question right before it, which the answer key was wrong. i wouldn't be surprised if this question was wrong too.

aaronq · Answer

the answer key is probably wrong, often they recycle questions but use different numbers

dtan5457 · Answer

yeah, well thanks for confirming i was right, the book is getting on my nerves lol

aaronq · Answer

haha that's happened to me too. It's so discouraging when you $think$ you keep getting the wrong answer