Homework Chapter 5 For Practice 5.11-Enhanced-with Feedback Part uch as zinc in
ID: 227996 • Letter: H
Question
Homework Chapter 5 For Practice 5.11-Enhanced-with Feedback Part uch as zinc in hydiachioric aod (sse tha Sgure) The hydrechlonc acid aacts wth g the metal to produce hydogen gas A commen way to make hydrogen gas in the laboratory is to place a metal s passure of 748 mnHg ard a temperature of 25 C What mass of en colected over water Suppose a student canes ihs reaction and calects , ttal of 1 600 mL of gas hydoogen gas in mgj does the studest collect? (The sapor pressure of water is 23 78 gn·wh ch i 1 Collecting a Gas over Water Expross the mass to three significae Figores and isclade the appropriate usitExplanation / Answer
volume of gas collected= 160ml, convertinh this inti liters,1000ml= 1L, 160ml= 160/1000L=0.16L
total pressure = 748 mm Hg , vapor presure of water= 23.78 mm Hg
partial pressure of dry gas= total pressure- saturation pressure of water= 748-23.78 =724.22 mm Hg
converting this into atm, 760 mm = 1 atm, 724.22 mm Hg= 724.22/760 atm=0.953 atm, hence V= 0.953 atm
T in K= 25+273= 298K, from gas law, moles of H2 collected, n= PV/RT, R= gas constant in 0.0821 L.atm/mole.K
n= 0.953*0.16/(0.0821*298) =0.00623
mass of hydrogen collected= moles* molar mass off H2= 0.00623*2=0.01246 gm
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