34) 1 Oxygen and fluorine are gaseous elements next to each other in the Periodic Table
Under the same conditions of temperature and pressure, oxygen diffuses
1 than fluorine because its 2 is less than that of fluorine.
Which words correctly complete gaps 1 and 2?
1
2
А
faster
molecular mass
B
faster
reactivity
с
slower
molecular mass
D
slower
reactivity

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.

the answer is a and have a great day