A calorimter of water equivalent \( 20 \mathrm{~g} \) contains \( 180 \mathrm{~g} \) of water at....

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A calorimter of water equivalent \( 20 \mathrm{~g} \) contains \( 180 \mathrm{~g} \) of water at \( 25^{\circ} \mathrm{C} \). ' \( \mathrm{m} \) ' grams of steam at \( 100^{\circ} \mathrm{C} \) is
\( \mathrm{P} \)
mixed in it till the temperature of the mixture is \( 31^{\circ} \mathrm{C} \).
W
The value of ' \( m \) ' is close to (Latent heat of water = \( 540 \mathrm{cal} \mathrm{g}^{-1} \), specific heat of water \( =1 \mathrm{cal} \mathrm{g}^{-1}{ }^{\circ} \mathrm{C}^{-1} \) )
(1) 2
(2) 4
(3) 3.2
(4) 2.6


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