Choose the compound with the greatest positional probability in each case.

a. \(1 \mathrm{~mol}_{\text {of }} \mathrm{H}_{2}\) at STP or \(1 \mathrm{~mol}_{\text {of }} \mathrm{H}_{2}\) at \(100^{\circ} \mathrm{C}\) and \(0.5 \mathrm{~atm}\)

b. \(1 \mathrm{~mol}\) of \(\mathrm{N}_{2}\) at STP or \(1 \mathrm{~mol}\) of \(\mathrm{N}_{2}\) at \(100 \mathrm{~K}\) and \(2.0 \mathrm{~atm}\)

c. \(1 \mathrm{~mol}\) of \(\mathrm{H}_{2} \mathrm{O}(s)\) at \(0^{\circ} \mathrm{C}\) or \(1 \mathrm{~mol}\) of \(\mathrm{H}_{2} \mathrm{O}(l)\) at \(20^{\circ} \mathrm{C}\)