What is the molar concentration of Ba present in 424 ppm of BaCl, 2H,0 (244.3 g/mol) A. 1.73x103 M B. 0.424 M . 1.73 D. More data is required to solve the problem Choose the correct value of entropy change for the following phase change: H,0(1,373 K,1atm)=H,0(g,373 K,latm) Standard enthalpy of formation of liquid water and gaseous water are -285.8 kJ mol and -241.8 kJ mol respectively. (A) 118 J (B) Data is not sufficient for entropy calculation (C) +118 J (D) 0J