道德作为一种特殊的社会意识形态，归根到底是由(    )决定的。
   A．社会关系    B．经济基础    C．生产关系    D．生产力

甲酸在金表面上的分解反应在温度为140℃和185℃时的速率常数分别为5.5×10-4s-1及9.2×10-2s-1，试求该反应的活化能。 点击查看答案

Dinitrogen pentaoxide, N2O5, is the anhydride of nitric acid. It is not very stable, and in the gas phase or in solution with a nonaqueous solvent it decomposes by a first-order reaction into N2O4 and O2. The rate equation is v=kc(N2O5) At 45℃, the rate constant for the reaction in carbon tetrachloride is 6.22×10-4s-1. Ifthe initial concentration of the N2O5 in the solution is 0.100mol·dm-3, how many minuteswill it take for the concentration to drop to 0.0100 mol·dm-3? 点击查看答案