of In a different experiment, 71.7 mL H2(9) was collected over water at 30.0° C
ID: 590899 • Letter: O
Question
of In a different experiment, 71.7 mL H2(9) was collected over water at 30.0° C and 29.46 inHg (inches of mercury) atmospheric pressure. (See Lab Manual Appendix 5 for the vapour pressure of water at various temperatures.) Calculate the number of moles of H2(9) collected ber of moles of tato) colectesu e of water at various temperatur 23,45 1 pts Submit Answer Incorrect. Tries 3/99 Previous Tries Calculate the corresponding number of moles of electrons to have passed through the circuit in this second experiment. 1 pts Submit Answer Tries 0/99 How many moles of O2(9) might you expect to have collected in this second experiment? 1 pts Submit Answer Tries 0/99 Suppose that this second experiment took 35.0 min at an average current of 242 mA. Use this data to calculate a value for Avogadro's number (Note that due to some possible experimental errors, this might not be exact y the same as the established literature value fo. A In our a report you will expected to describe what such errors might be and their effect on your actual experimental result. Also, while this particular LON-CAPA question does not require you to include units, you should, nevertheless, think carefully about what are the actual units associated with your answer.) 1 ptsExplanation / Answer
Volume of H2 gas = 71.7 mL = 0.0717 L
Pressure of H2 gas = Total pressure - vapour pressure of water = 29.46 * 25.4 mmHg - 31.824 mmHg
P = 716.46 mmHg = 716.46/760 = 0.943 atm
R = 0.0821 L.atm.K-1.mol-1
T = 30 + 273.15 = 303.15 K
Using Ideal gas equation,
P V = n RT
n = 0.943 * 0.0717 / ( 0.0821 * 303.15)
n = 0.00272 mol of H2
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.