MasteringChemistry: Homework: Electrochemistry (Chapter 20) Google Chrome Secure

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MasteringChemistry: Homework: Electrochemistry (Chapter 20) Google Chrome Secure https://session.masteringchemistry.com/myct/itemView?offset next&assignmentProblemID-95741917; A student designs an ammeter (a device that measures electrical current) that is based on the electrolysis of water into hydragen and oxygen gases. When electrical current of unknown magnitude is run through the device for 1.00 min, 16.2 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 showri here. T (°C) | P (torr) 18.7 19.8 21.1 22.4 23.8 25.2 28.7 28.4 30.0 31.8 21 Part A 23 many males of hydrogen gas are produced? Express your answer to three significant figures and include the appropriate units. Vlew Avallable Hints) 24 26 27 29 30 2.07 10-mol incorrect; One attempt remaining; Try Again You used the partial pressure of water vapor and so your answer is the number of moles of water vapor. What is the partial pressure of Part B This question will be shown after you complete previous question s) Type here to search 1059 AM 2018-04-16

Explanation / Answer

Step1 Pressure due to hydogen = [ 715 - Aqueous tension ] =715-23.8 = 691.2/760 atm

Step2 Absolute temperature = 298 K ; V = 16.2 ml = 1.62 x10^-2 litre

Step3 Use No of Moles n = PV/RT = [691.2 x1.62x10^-2]/[760x .082 x298]=6.02*10^-4 mol

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