Ascientist calculated the energy required to break bonds in two unknown compounds, a and b. one compound has a covalent bond, and the other has an ionic bond. the table shows a record of these values. bond energy compound a compound b 769 kj/mol 432 kj/mol based on the table, which of the following statements is true? compound a is covalent because transfer of electrons makes relatively stronger bonds. compound b is covalent because sharing of electrons makes relatively weaker bonds. compound a is ionic because sharing of electrons makes relatively stronger bonds. compound b is ionic because transfer of electrons makes relatively weaker bonds.

Compound B is covalent because sharing of electrons makes relatively weaker bonds.

Explanation:

Ionic bonds: Type of chemical bonds in which transfer of electrons from less electro-negative atom to highly electro-negative atom occurs and with higher value of bond energy.

Covalent bonds: Type of a chemical bond in which sharing of an electrons between the two atoms occurs. Here electro-negativity difference between the atom is very less or zero. Lower value of the bond energy than that of the ionic bonds.

Bond energy of compound A is 769 kJ/mol higher than the bond energy of the compound B that is 432 kJ/mol which means that compound A is ionic  and compound B is covalent.

So, compound B is covalent because sharing of electrons makes relatively weaker bonds.

compound b is covalent because of sharing of electrons makes relatively weaker bonds.

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: