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A long 12-cm-diameter steam pipe whose external surface temperature is 90∘C passes through some open area that is not protected against the winds. Find the rate of heat loss from the pipe per unit of its length when the air is at 1 atm pressure and 7∘C and the wind is blowing across the pipe at a velocity of 65 km/h.
A chemist isolated an aromatic compound with molecular formula
He treated this compound with nitric acid and sulfuric acid and isolated three different isomers, in different amounts, with molecular formula
What was the structure of the original compound?