Find the density of a piece of chocolate with these measurements: 2.4 g and 5.12 mL

List the two type of transporst that the cell in orde to transport molecules acroos the membrane

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?