Which of the following molecules is paramagnetic?

Which of the following statements is true about ideal gas ?

What is the change in entropy of surrounding for the reaction,
$\text{H}_{2(g)} + 1/2\ \text{O}_{2(g)} \rightarrow \text{H}_2\text{O}_{(l)}$
at 298 K if standard enthalpy of formation of water is $-286$ kJ ?

In a particular reaction, 4 kJ heat is released by the system and 12 kJ work done on the system. Calculate the $\Delta H$ and $\Delta U$.