【简答题】将下列段落翻译成中文 For a neutron - initiated chain- reaction, there must be a critical mass of the element present in a certain space under certain conditions. The conditions for the smallest critical mass re...
【简答题】Dinitrogen pentaoxide, N 2 O 5 , 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 N 2 ...
【单选题】The standard enthalpy changes of combustion of glucose and ethanol are given as –2820 and 368kJ mol–1 respectively.Glucose, C6H12O6, can be converted into ethanol. H12O6(s) → 2C2H5OH(l) + 2CO2(g) wh...