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A calorimeter of water equivalent 20 g contains 180 g of water at 25 ° C . m ' ' ' grams of steam at 100 ° C is mixed in it till the temperature of the mixture is 31 ° C . The value of m ' ' is close to (Latent heat of water = 540 cal g - 1 , specific heat of water = 1 cal g - 1 ° C - 1 )

Options

  1. A2
  2. B4
  3. C3 . 2
  4. D2 . 6

Correct answer

A. 2

Step-by-step solution

200 31 - 25 = m × 540 + m 1 69 1200 = m 609 m ≈ 2

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