17. What is the total number of molecules in a 0.5-mole sample of He gas?
A) 6 x 10^23
B) 2 x 10^23
C) 3 x 10^23
D) 4 x 10^23

What are the 4 phases of matter in order of increasing engery content?

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum

Water is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. which change of state has most likely taken place? from a gas to a liquid from a liquid to a gas from a solid to a liquid from a gas to a plasma