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A 10g piece of iron ( C =0.45 J//g^(@)C ...

A `10g` piece of iron `( C =0.45 J//g^(@)C )` at `100^(@)C` is dropped into `25g` of water `( C =4.2 J//g^(@)C)` at `27^(@)C`. Find temperature of the rion and water system at thermal equilibrium .

A

`30^(@)C`

B

`33^(@)C`

C

`40^(@)C`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
Heat lost by iron + Heat gained by water = 0
`10 xx0.45 (T -373)+25xx4.2 xx(T-300)=0`
`" "T=303" K or " 30^(@)C`
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NARENDRA AWASTHI-THERMODYNAMICS-Exercise
  1. Thermodynamic equilibrium involves

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  2. Which has maximum internal energy at 290K ?

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  3. A 10g piece of iron ( C =0.45 J//g^(@)C ) at 100^(@)C is dropped into ...

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  4. When freezing of a liquid takes place in a system it:

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  5. Mechanical work is specially important in systems that contain

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  6. Determine which of the following reactions taking place at constant pr...

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  7. Determine which of the following reactions at constant pressure rep...

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  8. A sample of liquid in a thermally insulated constant ( a calorimetre...

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  9. An ideal gas expand against a constant external pressure at 2.0 atmosp...

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  10. 2 mole of zinc is dissolved in HCl at 25^(@) C. The work done in open ...

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  11. 2 mole of an ideal gas at 27^(@)C expands isothermally and reversibly ...

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  12. A given mass of gas expands from state A to state B by three paths 1,2...

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  13. Heat energy absorbed by a system in going through a cyclic process sho...

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  14. In the cyclic process shown in the V-P diagram the magnitude of the wo...

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  15. An ideal gas is taken around the cycle ABCA as shown in P-V diagram. T...

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  16. The temperature of an ideal gas increases in an:

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  17. In following figs. Variation of volume by change of pressure is shown ...

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  18. If the door of a refrigerator is kept open, then which of the followin...

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  19. The temperature of an ideal gas increases in an:

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  20. For two mole of an ideal gas :

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