The basic units for density is

and any get of units that has those units in the proper place can be considered a density unit. The ones that has those specifically are A, B, E and F
No. The number of a protons is not equal to it's atomic weight, instead it is equal to the 'atomic number'
Answer:
2.881x10^23 atoms
Explanation:
From the studies of Avogadro's hypothesis, we discovered that 1mole of any substance contains 6.02x10^23 atoms.
Therefore 1mole of Fe contains 6.02x10^23 atoms.
Molar Mass of Fe = 56g/mol
56g of Fe contains 6.02x10^23 atoms.
Therefore, 26.8g of Fe will contain = (26.8x6.02x10^23) / 56 = 2.881x10^23 atoms
<span>Passive transport is a movement of biochemicals and other atomic or molecular substances across cell membranes without need of energy input.</span>
C. Paper <span>B. Metal thats bout it water no way </span>