How is Hess's law used to calculate the enthalpy of a reaction? A. The desired enthalpy is obtained through adding intermediate
reactions together.
B. The enthalpy is obtained from the difference in final and initial
reactions in a path.
C. Enthalpies from similar equations are substitubad for unknown
reaction enthalpies.
D. The final equation in a reaction path provides the enthalpy for the
desired reaction.

Consider the following system at equilibrium. caco3(s) ca2+(aq) + co32–(aq) the addition of which compound will cause a shift in equilibrium because of a common ion effect? ccl4 co2 cuso4 na2co3

Plz mark brainliest 30 points 1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s. 2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?

What are the first three quantum numbers for the electrons located in subshell 2s?