Chemistry Buffs: Question about an easy chem question

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soccerbud34

Senior member
Nov 15, 2001
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This is the only question i missed on my chem 301 test today and i do not undertand why.

How many moles of hydgrogen are contained in 3.00 moles of ethanol (CH3CH2OH)? <--- total of 6 Hydrogens

The answer is 6 moles, but i thought its 18 moles instead.
Can someone explain to me why?
 
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rgwalt

Diamond Member
Apr 22, 2000
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I would question the prof on that one.... one thing that isn't clear is whether you are talking about elemental H or molecular hydrogen (H2). Assuming it is atomic H, there are 18 moles of H in 3 moles of EtOH.

Ryan
 
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soccerbud34

Senior member
Nov 15, 2001
747
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Originally posted by: rgwalt
I would question the prof on that one.... one thing that isn't clear is whether you are talking about elemental H or molecular hydrogen (H2). Assuming it is molecular H, there are 18 moles of H in 3 moles of EtOH.

Ryan
Click to expand...

i just saw many of my classmates had the same question as i did. I am sure i'll get a regrading :)

3 hoorays for a perfect 100% !!
 
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Viper GTS

Lifer
Oct 13, 1999
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433
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Now that that's taken care of, IIRC in my chemistry classes we were never supposed to assume atomic H, always molecular unless otherwise specified...

That may be why he got it wrong.

Viper GTS
 
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Viper GTS

Lifer
Oct 13, 1999
38,107
433
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Originally posted by: rgwalt
The correct answer would still be 9 moles, instead of 6 moles...

Ryan
Click to expand...

Doh, I misread his original post... I didn't catch that the "correct" answer was given.

Sounds like the teacher effed up one way or another.

Viper GTS
 
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