MCAT Achiever PS 1 Q39

[Rolling Stone]

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It says complete combustion of coal yields CO2 and no H2O. I thought it would produce both CO2 and H2O though. Anyone here has a definite answer for this reaction? Thanks.

 

[BennieBlanco]

It says complete combustion of coal yields CO2 and no H2O. I thought it would produce both CO2 and H2O though. Anyone here has a definite answer for this reaction? Thanks.

Definitely not MCAT knowledge. Should be in the passage.

Found this online, but unsure of source quality:

C10H2 + O2 --> H20 + CO2
Balanced:
2C10H2 + 2102 --> 2H20 + 20CO2

but also this:

Combustion equation for coal:
C + O2 => CO2 (12 kg C)+(32 kg O) => (34 kg CO2)

lastly this, which shows why there is no "single" equation for coal:

1: it is mostly carbon (90% or more)
2: it contains oxygen, nitrogen and sulfur

I think it is difficult to find an exact answer because the composition of the above constituents of coal depends a lot on where it is mined. The chemical equation for coal C+O2>>>>>CO2

 

[Rolling Stone]

Definitely not MCAT knowledge. Should be in the passage.

Found this online, but unsure of source quality:

but also this:

lastly this, which shows why there is no "single" equation for coal:

Thanks, Bennie. It's actually hinted in the last part of the passage which I had not paid attention to. I used to be able to get by with AAMC without having had to refer to the passage very much though. What's your advice? Should I stick to the current skimming method or should I spend more time reading the passage before looking at the questions?

 

[JeetKuneDo]

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[JeetKuneDo]

Who uses mcat achiever? Get princeton review, berkely review or EK.

 

[ezsanche]

I would read the passage. The passage in the science section are really short and you can read and comprehend the whole thing in 2 to 3 minutes. I dont see how skimming will help that much.

 

[BennieBlanco]

I would read the passage. The passage in the science section are really short and you can read and comprehend the whole thing in 2 to 3 minutes. I dont see how skimming will help that much.

agreed. Real MCAT only requires very fundamental knowledge/understanding/reasoning.

Passage = priceless