Question

If you know that the change in entropy of a cup of coffee where heat was added is 20 J/K, and that the temperature of the coffee is 250 K. what is the amount of heat added to the cup of coffee? a)-15 J b)-125J c)-600J d)-5000J d)-6000J

Answer 1

5000J

Step-by-step explanation:

Given in the question that

Heat added to the coffee cup is, ΔS = 20 J/K

The temperature of the coffee, T = 250 K

Now, using the formula for the entropy change

`\bigtriangleup S=-(\bigtriangleup H)/(T)` ...........(1)

Where,

ΔS is the entropy change

ΔH is the enthalpy change

T is the temperature of the system

substituting the values in the equation (1)

we get

`20=-(\bigtriangleup H)/(250)`

ΔH=250×20

ΔH=5000 J