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this is the last one, i promise <3?
I only posted them all because i havent gotten any answers on any of them, and i really need to know how to do at least one of them so that maybe i can figure out the rest, so any help would be greatly appreciated, even if you cant do the whole problem, thank you! please explain so i can follow along !
it's CH3OH by the way just in case you cant read it cause it's blurry
1 Answer
- 8 years ago
It's been a while since I did chemistry, but if I'm not mistaken you would use q=mc delta T for a) where mass of the water would be 250g (converted fr cm3); c = specific heat, and delta T = change in temperature in this case would be 43-20 = 23. Plugging that in to solve for q should get you the heat energy going into the water. For b) I think all you have to do is subtract the final mass of burner + fuel from the starting (since mass of the burner stays the same, you would find the grams of fuel used). Take that mass and use the mol equation mol = mass / Molar mass to get the moles of fuel burnt (molar mass would be from the chemical formula CH3OH). I don't remember much about enthalpy so not gonna say anything. Hope that helped somewhat. Good luck!
