Question

262 Experiments in General Chemistry: Inquiry and Skill Building, 3rd EditionWilliamson/Peck/McCann During the decomposition of hydrogen peroxide, is it possible to determine the moles of dry gas being obtained using the following equation: (Poal Pho)Votal -ewg RT? Explain. 5. The following data were collected in an experiment in which hydrogen peroxide was decomposed to water and unknown gas. The data are given as mol unknown gas evolved/time in seconds elapsed 6. since the beginning of the experiment: 0.000125/30 0.000375/110 0.0000625/15 0.000188/40 0.000250/65 0.000313/90 0.000438/130 0.000500/150 0.000563/170 Plot these data, calculate the slope of the best straight line through zero (you may want to use the least squares program in a calculator), and give the numerical value and the units for the rate of formation of unknown gas. Date_ Student's Signature

Answer 1

5) The ideal gas equation, can relate the pressure variables and the amount of moles of a gas that produces that pressure, then when making the difference Ptotal - P H2O we would be calculating the pressure exerted by the unknown gas on the system, this it is called, partial pressure of unknown gas.

With this partial pressure, and the relationship of the ideal gas equation, we can determine the moles formed.

6) The graph is observed:

time mol mol 15 0,0000625 0,000125 0,000188 30 40 65 90 0,0006 0,00025 0,0005 0,000313 y-3E-06x + 4E-05 1100,000375 0,0004 0,0003 170 0,000563 0,0002 130 0,000438 0,0005 _mol 150 Lineal (mol) 0,0001 0 0 50 100 150 200

Where the value of the slope of the best straight line is:

m = 0.000003 mol / sec

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