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2gm of steam condenses when passed throu...

2gm of steam condenses when passed through 40 gm of water initially at `25^(@)C` . The condensation of steam raises the temperature of water to `54.3^(@)C` . What is the latent heat of steam

A

540 cal/g

B

536 cal/g

C

270 cal/g

D

480 cal/g

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