Give the mathematical expression for amount of substance and the mass of solute dissolved in a solution

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

How is energy related to the change of state represented by the model? atoms gain energy as a solid changes to a liquid. atoms gain energy as a solid changes to a gas. atoms lose energy as a solid changes to a liquid. atoms lose energy as a solid changes to a gas.