64% 12/03/17 ·12cante.to. 0 This is a Numeric Entry question/Itisworth4points /

Question

64% 12/03/17 ·12cante.to. 0 This is a Numeric Entry question/Itisworth4points / You have 2015attempts remaining /There is no att en a See page 451 14 Question 4 points) Students at the University of North Texas and the University of Washington built a car propelled by compressed nitrogen gas. The gas was obtained by boiling liquid nitrogen stored in a 195.0Ltank 4th attempt See Periodic Table O See Hint What volume of Nols released at o.955 atm of pressure and 25.0 °C froma tank of liquid N2 ld-0.808 g/mL? 3rd attempt See Periodic Table SeeHint What volume of Nals released at Q 955 atm of pressure and 250C from a tank of liquid Na (d-080Lp K 141s> 3

Explanation / Answer

Q14

liquid nitrogen V = 195 L

a)

mass of N2 = D*V = 0.808g/mL * 195 L *1000 mL/L = 157560 g

mol of N2 = mass/MW = 157560/18

mol of N2 = 5627.14

P V= nRT

V = nRT/P

V = (5627.14)(0.082)(25+273)/(0.955)

V = 143984.07 L

V = 1.44*10^5 L

Q15

mol of O2 = 0.117

mol of C reacted = 0.15 mol

mol of O2 left = 0.117-0.15*2/3 = 0.017

mol of CO produced = 0.15*2/3 = 0.10

mol of CO2 produced = 0.15/3 = 0.05

total mol of gas = 0.017+0.10 +0.05 = 0.167

x-CO = mol of CO/total 0.10/0.167 = 0.59880

P-CO = x-CO*Ptotal = 0.685*0.59880 = 0.410178 atm

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