Question 5 0 out of 0.5 points What is the vapor pressure of water at the experi

Question

Question 5 0 out of 0.5 points What is the vapor pressure of water at the experimental temperature? (See Appendix PH20 = _ mm Hg Selected Answer: 745 Question 6 o out of 0.5 points What is the pressure of dry H2 gas collected inthe experiment?(1 atm = 760 mm Hg) PH2 =-atm Selected Answer: 0.98 Question 7 0 out of 0.5 point Calculate the number of moles of H2 collected in the experiment. nH2-moles Selected Answer: 12.5 Question8 0 out of 0.5 point Calculate the number of moles of H2 evolved per gram of alloy used. N42moles Selected Answer: 58 0 out of 1 poin Question 9 Using equation 11 NH,-(100% Calculate the percent Al in your sample. mol) + (100%-NA·0.0153 100% %Al mol 100 ·0.0556 m Selected Answer: 14.38

Explanation / Answer

solved the first four problems as per Chegg guidelines, post multiple question to get the remaining answers

Q5)

Vapor Pressure of water = barometric pressure = 745 mm Hg (in our case)

Q6)

Pressure of dry H2O = 745 mm Hg

1 atm = 760 mm Hg

Pressure of H2O in atm = 745 mm Hg * 1 atm/760 mm Hg = 745/760 atm = 0.9802 atm

Q7)

Mass of H2O = (Mass of empty beaker + displaced water) - (Mass of empty beaker)

=> 368.9g - 144.5g

=> 224.4 grams

Molar mass of H2O = 1 * 2 + 16 = 18 gm/mol

Number of moles of H2O = Mass/molar mass = 224.4/18 = 12.4666 = 12.5 moles

Q8)

Number of moles evolved = 12.5 mol

Mass of metal = Mass of capsule + alloy - mass of capsule = 0.3432 - 0.1284 = 0.2148g

Number of moles evolved per gram of metal = Number of moles evolved/mass of metal used in experiment

=> 12.5/0.2148

=> 58.193 moles

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