Question

1. Circlethecorrect(mostappropriate)statement:

a) A well-insulated house stores a lot of heat

b) The walls of a well-insulated house approximate adiabatic boundary

c) The walls of a well-insulated house approximate diathermal boundary

d) All of these sentences are correct

e) None of these sentences is correct

2. Consider three systems at 37oC: a 1.0L sample of H2O, 100 L of Ne gas at 1.00bar pressure, and a small crystal of NaCl.

a) What is the thermal equilibrium status in terms of the varying sizes of the three systems?

b) Will there be any net transfer of energy if these three systems are brought into contact?

3. Standard ambient temperature and pressure (SATP) are as follows: T = 298.15 K and P = 1 bar (1 bar = 0.987 atm). Calculate the volume of 1 mole of an ideal gas at SATP.

4. A mixture of 2.50· 10-3 g of O2, 3.51· 10-3 mol of N2 and 4.67 ·1020 molecules of CO are placed into a vessel at 1 atm and 25°C. Note: 1 atm= 760 torr.
The partial pressure of CO is:

a) 135 torr b) 14 torr c) 611 torr d) 625 torr e) none of these

5. Aglassbulbof0.136Lvolumecontains0.7031gofagasat759.0torrand99.5°C. The molar mass of the gas (in g/mol) is:

a) 42.3 b) 208 c) 423 d) 158 e) none of these

6. Consider a 1.00 mole sample of SO2 that has a pressure of 5.00atm and volume of 10.0L. Predict the temperature of this sample of gas using the ideal gas and the van der Walls equations of state. Consider that a= 6.714 atm?L2/mol2 and b= 0.05636 L/mol.

7. Determine the change of pressure with respect to volume, all else remaining constant, for an ideal gas.

Answer 1

Ans 1

Option B is the correct answer

We will check all the given choices

Option A

Heat is a path function, heat is not a state function. Therefore Heat cannot be stored, heat can only be transferred. This statement is not right.

Option B

Well insulated walls prevents the rate of heat transfer from surroundings to house and from house to surroundings. It can ve approximated as adiabatic boundary.

Option B is the correct answer

Option C

Dithermal boundary allows the transfer of heat from house to surroundings and from surroundings to house. In this case, the walls are not insulated.