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Q. 38

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 544

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Short Answer

A 5.0 g ice cube at -20°C is in a rigid, sealed container from which all the air has been evacuated. How much heat is required to change this ice cube into steam at 200°C? Steam has CV = 1500 J/kgK and CP = 1960 J/kgK

15.9 kJ heat is required to change this ice cube into steam at 200°C

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Step by Step Solution

Step 1: Description of provided information 

A 5.0 g ice cube at -20°C is in a rigid, sealed container from which all the air has been evacuated.

The required heat for the heating process:

Step 2: Result of finding the accurate heat

The required heat for the heating process:

For the phase transition

Q=mL

For melting

For evaporating

Thus the needed heat is on the basis of numeric values:

As 5g =0.005 kg, the accurate answer is 15.9 kJ.

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