Organic 2 Review Problem 476

Organic 2 Review Problem 476 - 460 PRACTICAL O RGANIC C...

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460 PRACTICAL ORGANIC CHEMISTRY reading in A, and so determine the volume of gas evolved. Note the temperature of the water in F and the barometric pressure. A Hempel gas-burette (Fig. 76, p. 426) may be used in place of the tubes A and H: for this purpose it is manipulated precisely as described on p. 427. Example of Calculation. Weight of urea taken . . . . . . 0-144 g. Volume o f nitrogen obtained .... . 53-2 ml . Barometric pressure, 757 mm. Temperature, i8°C. Vapour pressure of water at i8°C., 15-4 mm. (Table II, p. 534). 53-2 ml. of nitrogen reduced to S.T.P. become 53-2 X 273 x (757 - 15-4) = 48-7 ml. 291 x 760 357 ml. of nitrogen are given by i g. of pure urea. .'. 48-7 ml. of nitrogen are given by 48-7/357 g. of pure urea i.e., 0-144 S' °f urea contains . 48*7/357 g. of pure urea . 487 X IQO , . ioo g. ot urea contain . g. of pure urea 357 X 0-144 ~ 94'7% urea. Estimation
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This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.

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