Consider the reaction 2A + 3B ⟶3C + 2D. The standard enthalpy of formation for A, B, C and D are -79.8, 49.2, -145.8, and -87.4, respectively in kJ / mol. What is the standard enthalpy change for the reaction in kJ/mol?

Read these sentences from the text. near the equator, the tropics receive the most rain on a consistent basis. as a result, the fresh water falling into the ocean decrease the salinity of the surface water in that region. [. .] . . as the salt content of sea water increases, so does its density. what can you infer about how rain affects the density of surface water near the equator?

How air particles exert a pressure on the inside of the balloon

Which type of orbits are found in the principal energy level n = 2 a - s b - s, f c - s, d d - s, p e - s, p, d