The value of entropy of the universe is

$1$ mole of a diatomic gas is heated through an isochoric process from $300\,K$ to $500\,K$. The change in entropy is: (in $,J/K$)

The enthalpy of fusion of water is $6.01 \, kJ \, mol^{-1}$. The entropy change of $1 \, mole$ of ice at its melting point will be.....$J \, K^{-1} \, mol^{-1}$.

For the reactions,
$2 Cl_{(g)} \longrightarrow Cl_{2(g)}$
$CO_{2(g)} \longrightarrow CO_{(g)} + \frac{1}{2} O_{2(g)}$
What are the signs of $\Delta S$, respectively?

What is the change in entropy when an ideal gas expands into a vacuum?

During which of the following processes does entropy decrease?
$(A)$ Freezing of water to ice at $0^{\circ} C$
$(B)$ Freezing of water to ice at $-10^{\circ} C$
$(C)$ $N_{2(g)} + 3H_{2(g)} \rightarrow 2NH_{3(g)}$
$(D)$ Adsorption of $CO_{(g)}$ on a lead surface
$(E)$ Dissolution of $NaCl$ in water