A sample of an ideal gas is heated and its Kelvin temperature doubles. If the sq

Question

A sample of an ideal gas is heated and its Kelvin temperature doubles. If the squareroot-mean-square speed of its molecules was originally v, what is the new squareroot-mean-square speed? 4v 2v 1.4v 1.8v v How many moles are there in 4.00 kg of copper? The atomic weight of copper is 63.5 g/mol and its density is 8.90 g/cm3. 63.0 131.5 51.3 73.1 An ideal gas is compressed isothermally to one-third of its initial volume. The resulting pressure will be three times as large as the initial value. less than three times as large as the initial value. more than three times as large as the initial value. equal to the initial value. impossible to predict on the basis of this data. A closed 2.0-L container holds 3.0 mol of an ideal gas. If 200 J of heat is added, and no work is done, what is the change in internal energy of the system? zero 100 J 150 J 200 J A 3500 J ol heat is added to a system during a process in which 1800 J of work are do on the system. What is the change of internal energy of the system. -700 J 700 J 4000 J 4300 J 5300 J An ideal Carnot engine extracts of heat from a high-temperature reservoir at 1200 during each cycle, and rejects heat to a low-temperature reservoir at 700K during the cycle. What is the efficiency of the engine? 0.57 0.35 0.42 0.70

Explanation / Answer

11.
Vrms = sqrt[3kT/m]

now T is doubled then Vrsm will be become sqrt(2) times.

ans. 1.4v

12.moles = mass / molar mass

        = (4 x 10^3 g ) / (63.5g/mol)

       = 63 mol

13. PV = constant

V is one third then pressure will be become three times.

Ans(A)

14.change in interal energy = 200 J

15. change in internal energy = 3500 + 1800 = 5300 J

16. e = 1 - Tc/Th

    1 - 700/1200 = 0.42

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