In the chemical reaction N²O⁴ --> N²+2 O², the bond enthalpy of the reaction is 1779 kJ and the bond enthalpy of the product is 1931 kJ. what is the enthalpy of the reaction? please explain your work, and no links​

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.

Which is an example of the practical pursuit of alchemy? a. forming perfect substances. b. transforming base metals. c. developing metalworking techniques. d. linking spiritual characteristics with material substances.

How does the presence of oxygen affect the chemical pathways used to extract energy from glucose?