Dr. Collins PCAT practice problem help

[soonerfan989]

What volume of ethane is needed to react with 21L of Oxygen? 2CH6 + 7O2➡ 4CO2 + 6H2O. This is in the section of the law of combining volumes. The answer they got was 6L and I keep getting a different answer. Can someone please help?

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[owlegrad]

The ratio is 2:7, right? So increase 7 to 21 and 2 increases to 6, right? Been awhile though I could be off base.

 

[Sugoi Travis]

The ratio is 2:7, right? So increase 7 to 21 and 2 increases to 6, right? Been awhile though I could be off base.

That's right.