Which of the following must be true about a reaction if it is only spontaneous at high temperatures?
a.) it is exothermic, with both negative enthalpy and entropy changes.
b.) it is endothermic, with both positive enthalpy and entropy changes.
c.) it is exothermic, with a negative enthalpy and positive entropy change.
d.) it is endothermic, with a positive enthalpy and negative entropy change.

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

Both josef loschmidt and amedeo avogadro contributed to our understanding of basic molecular numbers, sizes, and reaction ratios. neither scientist discovered “avogadro’s number” in the form we use it today (6.02 x 10 23). still, there’s a controversy over the name. research the contributions from these two scientists and read about how avogadro’s number got its name. briefly state what you think this number should be called, providing key details of each scientist’s contributions to this concept and a solid rationale for your case in naming the number.

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?