6.8. Liquid methyl ethyl ketone (MEK) is introduced into a vessel containing air. The system temperature is increased to 55°C, and the vessel contents reach equilibrium with some MEK remaining in the liquid state. The equilibrium pressure is 1200 mm Hg. (a) Use the Gibbs phase rule to determine how many degrees of freedom exist for the system at equilibrium. State the meaning of your result in your own words. (b) Mixtures of MEK vapor and air that contain between 1.8 mole% MEK and 11.5 mole% MEK can ignite and burn explosively if exposed to a flame or spark. Determine whether or not the given vessel constitutes an explosion hazard.

A) Degree of Freedom (DF) = 2 and this means that 2 variables are required to determine the state of the system

B) The vessel doesn't constitute an explosion hazard.

Explanation:

A) Degree of Freedom(DF)=2 + C - π

Where;

π = 2 (liquid and gas phase equilibrium)

C = 2 (air and MEK)

Thus, DF = 2 + 2 - 2 = 2

DF of 2 means that 2 variables are required to determine the state of the system

B) Using Antoine Equation;

Log(Pmek) = 6.97421 - (1209.6/(55 + 216)) = 2.51

Log(Pmek) = 2.51

Thus,Pmek = 10^(2.51) = 323.59mm of Hg or approximately 324mm of Hg.

So, fraction of mek in vapour phase = 324/1200 = 0.27 or 27%

Now this fraction is more than 11.5% in the question.

Therefore, the vessel contains no explosion hazard.

fire could start, buildings collapsing, and ash falling from the sky.

explanation:

this is because the buildings or plants could catch on fire and the buildings would most likely collapse. lastly ash would fall because all the burning would cause ash to fall from the sky.

hope this .

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."