How many molecules of oxygen gas are in 1.42 moles of oxygen gas ?

You have 1.42mol O2.

If 1mol is 6.022*1023 molecules of O2, then 1.42mol O2 is equal to 1.42*6.022*1023 molecules of O2. This gives a total of approx. 8.55*1023 molecules of oxygen gas.

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.