Calculate the energy needed to boil 4 moles of water beginning at 85C into steam with a final temperature of 100-C. Boiling point of water = 100°C
specific heat of water = 4.184 J/g*C
Enthalpy of vaporization of water = +40.7 kJ/mol

84 kJ
163 kJ
168 kJ

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.  

the answer is true.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8