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Chapter 19: Q. 14 (page 543)

a. 100 J of heat energy are transferred to 20 g of mercury. By how much does the temperature increase?

b. How much heat is needed to raise the temperature of 20 g of water by the same amount?

Short Answer

Expert verified

a. the value of

∆T=35.7oC

b. the value of heat isQ=3kJ

Step by step solution

01

Definition of first law of thermodynamics

First law of thermodynamics define the energy does not create or destroy in the universe

02

Finding the value of heat

a. The equation of first law is∆Ethi=W+Q

Thermal energy for the charges of temperature is

As the work done is zero so Q =Mc∆T

applying all values

∆T=QMc=100J20×103140J/K.Co=35.7oC

Applying all values

Q=Mc∆T=0.2kg4190J/K.Co35.7oC=3kJ

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