Part B Calculate the magnitude of the current in amperes if the number of moles

Question

Part B Calculate the magnitude of the current in amperes if the number of moles of hydrogen gas produced is 5.13×10?4 mol (from part A). Express your answer to three significant figures and include the appropriate units.

± Electrolysis and Current A student designs an ammeter (a device that measures electrical current) that is based on the electrolysis of water into hydrogen and oxygen gases. When electrical current of unknown magnitude is run through the device for 3.50 min, 13.8 mL of water-saturated H2(g) is collected. The temperature and pressure of the system are 25 °C and 715 torr The vapor pressure of water changes with temperature, as shown here T (C) P (torr) Part A 18.7 How many moles of hydrogen gas are produced? Express your answer to three significant figures and include the appropriate units 19.8 24 25 26 27 28 29 30 22.4 23.8 25.2 26.7 28.4 30.0 31.8 5.13x104 mol Submit Hints My Answers Give Up Review Part Correct Using the stoichometric coefficients in the chemical equation you can determine that 2.57x104 mol of oxygen gas is produced, which is half the number of moles of hydrogen gas produced 2H20(1)2H2 (g) O2 (g) Part B Calculate the magnitude of the current in amperes if the number of moles of hydrogen gas produced is 5.13x104mol (from part A). Express your answer to three significant figures and include the appropriate units HA 1.64 amp

Explanation / Answer

faradays first law

W = Zit

W = mass of H2 = 5.13*10^(-4)*2 = 0.001026 grams

Z = E/F

E = equivalentweight of H2 = 2/2 = 1

0.001026 = (1/96500)*i*3.5*60

i = 0.47 amp

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