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100 ~g of water is heated from 30^ C to 50^ C . Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4148 ~J / kg / K ):

Options

  1. A8.4 ~kJ
  2. B84 ~kJ
  3. C2.1 ~kJ
  4. D4.2 ~kJ

Correct answer

A. 8.4 ~kJ

Step-by-step solution

Q = U + W (ignoring expansion) U = ms T =0.1 4.184 20=8.368 ~kJ

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