Question 12 of 40
What is the highest number of electrons that can be in electron shell 2?

8

Explanation:

the 1st shell closer to the nucleus is 2

2nd 8

3rd 8 etc

In shell to or L shell can only afford 8 electrons according to the OCTECT rule. Also, the outermost shell of any atom can only afford 8 electrons according to the octect rule

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.

a polar bond is formed when electrons are shared unevenly between atoms