How to Calculate Enthalpy and Entropy Change for SiC Heating?

[asdf1]

how do you solve the following problem?

calculate the change in enthalpy and the change in entropy when 1 mole of SiC is heated from 25 degrees C to 1000 degrees C.
Cp=50.79+1.97*(10^-3)T-4.92*(10^6)(T^-2)+8.2*(10^8)(T^-3) J/(mole*K)

 

[siddharth]

The variation of Entropy with temperature for a system is given by
$$S(T_f) = S(T_i) + \int \frac{dq_{rev}}{T}$$
When the system is under constant pressure and there is no non-expansion work,
$$dq_{rev} = C_p dT$$

 

[asdf1]

how do you know that the question is under constant pressure?

 

[ChronicQuantumAddict]

because they give u Cp, which is the specific heat at constant pressure

 

[asdf1]

@@
how do you know that there's no non-expansion?

 

[siddharth]

Non expansion work is work done by the system other than in expansion.
For example, electrical work. So unless it is specifically stated, there is usually no non-expansion work.

 

[asdf1]

thank you very much!