题目

Life isn't meant to be easy and you have to _____ some pain to learn the skills to move forward．（ ） A．hold back     B．give away    C．go through   D．turn down 答案：C含11.2g KOH的稀溶液与1L  0.1mol/L的H2SO4溶液反应放出11.4kJ的热量，下列能正确表示中和热的热化学方程式是A． KOH(aq)  + 1/2 H2SO4(aq)  =1/2K2SO4(aq) + H2O (l);ΔH＝－11.46kJ/molB．2KOH(s)  +  H2SO4(aq) = K2SO4(aq) + 2H2O (l);ΔH＝－114.6kJ/molC．2KOH(aq)  +  H2SO4 =K2SO4(aq)+ H2O (l) ;ΔH＝＋114.6kJ/molD．KOH (aq)  + 1/2 H2SO4(aq)  = 1/2 K2SO4(aq)+ H2O (l) ;ΔH＝－57.3kJ/mol