Thermol part 3

1.80 mol of an ideal gas is taken from a volume of 3.00 m3 to a volume of 1.50 m3 via an isothermal compression at 30oC. How much energy is transferred as heat during the compression?

• -3140J

• -3.14J

• -31.4J

• -314J

The adiabatic relation between volume and temperature of an ideal gas is:

• a. Vγ-1 T = constant

• b. V1+γ Tγ = constant

• c. V1-γ Tγ+1 = constant

• d. V1-γ Tγ-1 = constant

The work done by an adiabatic expansion is written as:

• a. W=0

• b. W= P2V2-P1V1/γ-1

• c. W=P2V2ln⁡(P1/P2)

• d. W= P2V2-P1V1/1-γ

For an ideal diatomic gas:

• a. Cv = 20.8 J/mol.K

• b. Cv = 28.5 J/mol.K

• c. Cv = 20.8 J/K

• d. Cv = 25.5 J/K

A gaseous mixture consists of 16g of Helium and 16g of Oxygen. The ratio CpCv of the mixture is:

• a. 1.4

• b. 1.54

• c. 1.59

• d. 1.62

For a diatomic gas, the value of γ = Cp/Cv is:

• a. 9/7

• b. 7/5

• c. 5/3

• d. 5/7

A diatomic gas, compressed isobarically, did 42 J of work. Which was the amount of heat given to the gas during such process?

• 147 J

• 137 J

• 127 J

• 117 J

A monatomic gas is suddenly compressed to (18)th of its initial volume adiabatically. The ratio of its final pressure to the initial pressure is

• a. 32

• b. 8

• c. 1/32

• d. 1/8

Which of the following statements is correct

• a. Cp can never be less than Cv

• b. Cp Cv in some specific cases

• c. Cp may be less than Cv depending on the gas

• d. Cp may be equal to or less than Cv

One mole of a monoatomic ideal gas is mixed with one mole of a diatomic ideal gas. The molar specific heat of the mixture at constant volume is:

• a. R

• b. 2R

• c. 0.5 R

• d. 4R