If the density of solid chromium is 7.15 g/cm3 , what is the packing efficiency of Cr if it adopts a body‑centered cubic unit cell? The molar mass of Cr is 51.996 g/mol .

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.

Which of the following isotopes has the same number of neutrons as phosphorus-31?

2. what two items do autotrophs take from the environment to produce their food? 3. what are the two items that are released during transpiration from leaves? 4. what are the two membranes of the system? a.what are the two stages of photosynthesis? what are the two parts of photosynthesis?