2gm of steam condenses when passed through 40gm of water initially at 25^oC. condensation of steam r

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10-1.Thermometry, Thermal Expansion and Calorimetry

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$2\;gm$ of steam condenses when passed through $40gm$ of water initially at $25^oC.$ The condensation of steam raises the temperature of water to $54.3^oC.$ What is the latent heat of steam ........... $cal/g$

A

$540$

B

$536$

C

$270$

D

$480$

Solution

(a) Let $L$ be the latent heat and using principle of calorimetry.

$2L + 2 (100 -54.3) = 40 \times (54.3 -25.3)$

$\Rightarrow$ $L = 540.3\, cal/gm.$

Standard 11

Physics

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