Heat and Thermodynamics 1 Question 16

16. Steam at 100C is passed into 1.1kg of water contained in a calorimeter of water equivalent 0.02kg at 15C till the temperature of the calorimeter and its contents rises to 80C. The mass of the steam condensed in kg is

(1986, 2M)

(a) 0.130

(b) 0.065

(c) 0.260

(d) 0.135

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Answer:

Correct Answer: 16. (a)

Solution:

  1. Heat required Q1=(1.1+0.02)×103×1×(8015)

=72800cal

Heat given it m (in kg ) steam is condensed :

Q2=(m×540×103)+m×1×103×(10080)

Equating Q1=Q2, we get

m=0.130kg



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