Which of the following has the greatest mass, in grams? a)0.3 mol iron fe b)1 atom silver ag c)25 atoms lead pb d)1 mole of hydrogen atoms h

Since we are given the amount of moles of each element, to calculate for the mass we need to remember that:

Mass = Molar mass * Moles

Moles = Atom / (6.022*10^23 atoms / mole)

6.022*10^23 atoms / mole is the Avogadro’s constant to convert atoms to moles.

So when atoms are given: Mass = Molar mass * Atom / 6.022*10^23

Searching for the molar mass of each element in the periodic table:

Iron (Fe) = 55.85 g / mol

Silver (Ag) = 107.87 g / mol

Lead (Pb) = 207.2 g / mol

Hydrogen (H) = 1 g / mol

Therefore calculating for the mass:

A. Mass of Fe = (55.85 g / mol) * 0.3 mol

Mass of Fe = 16.76 g

B. Mass of Ag = (107.87 g / mol) * 1 atom / (6.022*10^23 atoms / mole)

Mass of Ag = 1.8 * 10^-22 g

C. Mass of Pb = (207.2 g / mol) * 25 atom / (6.022*10^23 atoms / mole)

Mass of Pb = 8.6 * 10^-21 g

D. Mass of H = (1 g / mol) * 1 mol

Mass of H = 1 g

Therefore 0.3 mol of iron has the greatest mass among the 4 elements.

 0.3 mol of iron Fe

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .