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When unit mass of water boils to become ...

When unit mass of water boils to become steam at `100^(@)C`, it absorbs Q amount of heat. The densities of water and steam at `100^(@)C` are `rho_(1)` and `rho_(2)` respectively and the atmospheric pressure is `P_(0)`. The increase in internal energy of the water is

A

`Q`

B

`Q +P_(0)((1)/(rho_(1)) - (1)/(rho_(2)))`

C

`Q + P_(0)((1)/(rho_(2)) - (1)/(rho_(1)))`

D

`Q - P_(0)((1)/(rho_(1)) + (1)/(rho_(2)))`

Text Solution

Verified by Experts

The correct Answer is:
B
`Q = DeltaU +W implies +Q = DeltaU +P_(0)(V_(2)-V_(1))`
` implies Q = DeltaU + P_(0)((1)/(rho_(2))- (1)/(rho_(1))) implies DeltaU = Q + P_(0)((1)/(rho_(1))-(1)/(rho_(2)))`
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ALLEN -GEOMETRICAL OPTICS-EXERCISE -02
  1. An ideal gas can be expanded form an initial state to a certain volume...

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  2. Pressure versus temperature graph of an ideal gas is shown in figure. ...

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  3. When unit mass of water boils to become steam at 100^(@)C, it absorbs ...

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  4. N molecules, each of mass m of gas A and 2 N molecules each of mass 2m...

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  5. A vessel is partitioned in two equal halves by a fixed diathermic sepa...

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  6. A closed vessel contains a mixture of two diatomic gases A and B. Mola...

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  7. N (lt 100) molecules of a gas have velocities 1,2,3….N km/s respective...

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  8. Let barv,v(rms) and vp respectively denote the mean speed. Root mean s...

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  9. The following are the P-V diagrams for cyclic processes for a gas. In ...

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  10. The internal energy of a system remains constant when it undergoes (...

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  11. C(p) is always greater than C(V) due to the fact that:-

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  12. An ideal gas is heated from termperature T(1) to T(2) under various co...

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  13. The indicator diagram for two processes 1 and 2 carrying on an ideal g...

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  14. An ideal monoatomic gas undergoes a cyclic process ABCA as shown in th...

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  15. Logarithms of readings of pressure and volume for an ideal gas were pl...

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  16. A thermodynamic system undergoes cyclic process ABCDA as shown in figu...

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  17. A thermally insulated chamber of volume 2V(0) is divided by a friction...

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  18. One mole of an ideal monoatomaic gas is taken from A to C along the pa...

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  19. The thermal capacity of 40 g of aluminium (specific heat =0.2 cal//gm^...

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  20. Two cylinders A and B fitted with pistons contain equal amounts of an ...

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