How many moles are in 4.81x10^24 atoms of boron(B) ? Show all of your work. Include units. round your answer to the correct number of significant figures.

7.99 moles of boron

Explanation:

Given data:

Number of moles of B = ?

Number of atoms of B = 4.81 × 10²⁴ atom

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

4.81 × 10²⁴ atom × 1 mol / 6.022 × 10²³ atoms

0.799 × 10¹ mol

7.99 moles

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 .