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Thermal Energy

If 2 kg of st...

Question

If 2 kg of steam at $100^{o} C$ condenses into water at $40^{o} C$ the energy released in calories is $(L = 540 c a l g^{- 1}, s = 1 c a l g^{- 1}^{o} C^{- 1})$ .

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Solution

Heat evolved
$= m L + m s θ = m (L + s θ)$
$= 2000 (540 + 60)$
$= 2000 \times 600 = 1200 k c a l$

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