Rank the following materials from highest bp to lowest bp: a. n2, naf, nh3, ni, hib. ag, h20, ar, hbr, kc c. lif, fe, f2. hf, hci

Explanation:

Metallic solids are defined as the solids in which atoms of metals are held together by metallic bonds. These bonds are much stronger than an ionic bond.

In metallic solids, the electrons are delocalized in nature. On the other hand, ionic solids have strong bonds due to the presence of opposite charges on its combining atoms.

Molecular solids are defined as the solids in which atoms are combined together through Vander waal forces. Hence, molecular solids have low boiling point.

(a) It is known that is a molecular solid, NaF is an ionic solid, in there exists hydrogen bonding between the molecules, and Ni is a metallic solid. Hence, the given materials are placed according to highest B.P. to lowest B.P. as follows.

            Ni > NaF > > HI >

(b)   Ag is a metallic solid, and KCl is an ionic solid. Oxygen atom is more electronegative than bromine atom. So, the boiling point of is more than the boiling point of HBr. Whereas Ar is a noble gas and it has low boiling point.

Hence, the given materials are placed according to highest B.P. to lowest B.P. as follows.

             Ag > KCl > > HBr > Ar

(c)    Fe is also a metallic solid and electronegativity of fluorine is more than the electronegativity of chlorine. Hence, HF has high boiling point than HCl. And, being a covalent compound has weak intermolecular forces. So, the boiling point of will be the least.

Therefore, the given materials are placed from highest B.P. to lowest B.P. as follows.

           Fe > LiF > HF > HCl >  

the grams   of   barium that   are in   2.3 x 10^23   atoms of barium   is   52.4 g (answer c)

    calculation

mass = moles   of ba   x molar   mass of ba

  molar mass of ba from periodic table=   137.3 g/mol

  use the   avogadro's law   constant   to   calculate the moles of barium

  that   is     1 mole =   6.02   x 10^23 atoms

                    ? moles = 2.3 x 10^23   atoms

by cross   multiplication

=(1 mole   x 2.3x 10^23 atoms)   / 6.02   x10^23 atoms)=   0.382   moles

mass   is therefore = 137.3   g/mol x 0.382 mol = 52.4 ( answer c)

explanation:

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