PLEASE HELP ASAP What is the mass of a sample of NH3 containing 3.80 × 1024 molecules of NH3?

74.8 grams
89.4 grams
101 grams
107 grams

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

Which type of precipitation would most likely form when the surface air temperature is slightly below freezing and the air temperature increases as you move upward away from the ground?

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?