A professor insists that a research scientist in her laboratory repeat an
experiment, despite the fact that the experiment took several weeks to
complete. Which best explains the professor's reasoning?

This is to make sure that the experiment is precise as outside disturbance could cause false outcome

the solar system used to have much dust particles option no d

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"