Question

Conso Current System 800 mL BEAKER Suppose that, during one electrolysis experiment, the power supply produced a steady current of 545. mA for a duration of 67.7 minutes. What amount of electrical charge will have passed through the cell? (Note that the SI unit for electrical charge is the coulomb -- represented by the symbol "C".) 2214 C 1 pts You are correct. Your receipt no. is 162-5194 Previous Tries Given that the charge on a single electron is 1.602x10-19 C, how many electrons will have been transferred through the cell? 1.38x1022 1 pts You are correct. Your receipt no. is 162-2065 Previous Tries In a different experiment, 88.7 mL H2(9) was collected over water at 14.0° C and 29.90 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(g) collected. 3.606 1 pts Submit Answer Incorrect. Tries 2/99 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(g) might you expect to have collected in this second experiment? 1 pts Submit Answer Tries 0/99 Suppose that this second experiment took 35.5 min at an average current of 322 mA. Use this data to calculate a value for Avogadro's number. (Note that due to some possible experimental errors, this might not be exactly the same as the established literature value for Ap. In your lab report you will be 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 pts Submit Answer Tries 0/99

Answer 1

No. of moles of H2 gas collected (n) = PV/RT = (29.90*2.5*10/760 atm) * (88.7/1000) L/(0.0821 L.atm.mol^-1.K^-1 * 287 K) = 0.0037025 mol

Note: 1 atm = 760 mmHg, 1 in = 2.5 cm, 1 cm = 10 mm, 1 L = 1000 mL, 0 ^oC = 273 K