12 grams of monatomic helium (MOLAR MASS of 4 g/mol) have a temp of 20 c and a p

ID: 3892101 • Letter: 1

Question

12 grams of monatomic helium (MOLAR MASS of 4 g/mol) have a temp of 20 c and a pressure of 1.20 atm.

a. calculate # of moles

b. calculate volume

c. calc avg kinetic energy of helium atoms

the volume is then quadrupled while the pressure and number of moles remain same.

e. name process used to do so

f. calculate new temp

g.calculate heat input (or output, please specify) for the gas during this process

h. calculate work input (or output, specify) for the gas during this process

i. calculate the change in thermal energy for the gas during this process

need as much worik shown as possible

ill give points for most complete

thanks

a)Moles=mass/molar mass=3 moles

b)volume=nRT/P=3*8.314*293/(1.2*101325)=0.06m^3=60l

c)KE=1.5kT=6.07*10^-21J

e)Isobaric

f)V1/T1=V2/T2

T2=V2/V1*T1=4T1=4*293=1172K=899C

g)Q=nCp(Tf-Ti)=3*2.5R(899-20)=54810J=54.8kJ

h)W=nR(Tf-Ti)=21924J=21.9kJ

i)Internal energy change=nCv(Tf-Ti)=3*1.5*8.314*(899-20)=32886J=32.89kJ

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