Jetermine the sign of Ssys and Ssurr for each chemical reaction shown below. Also, forecast for which temperatures (all temperatures, low temperatures, or high emperatures) the reactions will be spontaneous. (a) C2H5OH(I)+3O2(g)2CO2(g)+3H2O(g)Hrxn=1234.8kJ/mol sign of Ssys : positive negative sign of Ssurr : positive negative spontaneity: spontaneous at all temperatures spontaneous only at low temperatures spontaneous only at high temperatures not spontaneous at any temperature (b) SiCl4(I)+2H2O(l)SiO2(s)+4HCl(g)Hrxn0=21.3kJ/mol sign of Ssys : positive negative sign of Ssurr : positive negative spontaneity: spontaneous at all temperatures spontaneous only at low temperatures spontaneous only at high temperatures not spontaneous at any temperature (c) Si(s)+O2(g)SiO2(s)Hrxn0=910.7kJ/mol sign of Ssys : positive negative sign of Ssurr : positive negative spontaneity: spontaneous at all temperatures spontaneous only at low temperatures spontaneous only at high temperatures not spontaneous at any temperature (d) 2NO2(g)2NO(g)+O2(g)HrXn=+116.2kJ/mol sign of Ssys : positive negative sign of Ssurr : positive negative spontaneity: spontaneous at all temperatures spontaneous only at low temperatures spontaneous only at high temperatures not spontaneous at any temperature