For the process dry ice $\rightarrow CO_{2(g)}$,which of the following is true regarding the thermodynamic parameters?

  • A
    $\Delta H$ is positive while $\Delta S$ is negative
  • B
    Both $\Delta H$ and $\Delta S$ are negative
  • C
    Both $\Delta H$ and $\Delta S$ are positive
  • D
    $\Delta H$ is negative while $\Delta S$ are positive

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Two moles of an ideal gas are expanded isothermally from $15 \ dm^3$ to $20 \ dm^3$. If the amount of work done is $-6 \ dm^3 \ bar$,find the external pressure needed to obtain this work.

For the isothermal reversible expansion of an ideal gas,which of the following is correct?

Which of the following are extensive properties?
$(A)$ Heat capacity
$(B)$ Entropy
$(C)$ Gibbs' energy
$(D)$ Concentration
$(E)$ Vapour pressure

Identify the pair in which both are not extensive properties.

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