Calculate the entropy change when 1.86 g of H2 reacts with O2 according to the reaction 2H2(g) + O2(g) ! 2H2O() at 298 K and 1 atm pressure.

Calculate the entropy change when 1.86 g ofH2 reacts with O2 according to the reaction2H2(g) + O2(g) ! 2H2O(ℓ)at 298 K and 1 atm pressure. The stan-dard molar enthalpy of formation of H2O(ℓ)at 298 K is −285.8 kJ/mol. The correspond-ing free energy of formation is −237.2 kJ/mol.Answer in units of J/K.