The estimated heat of vaporization of diethyl ether using the chen's rule is a. 29.7 kj/mol b. 33.5 kj/mol c. 26.4 kj/mol d. 36.8 kj/mol

C. 26.4 kJ/mol

Explanation:

The Chen's rule for the calculation of heat of vaporization is shown below:

Where,

is the Heat of vaoprization (J/mol)

is the normal boiling point of the gas (K)

is the Critical temperature of the gas (K)

is the Critical pressure of the gas (bar)

R is the gas constant (8.314 J/Kmol)

For diethyl ether:

Applying the above equation to find heat of vaporization as:

The conversion of J into kJ is shown below:

1 J = 10⁻³ kJ

Thus,

Option C is correct

at the bottom

explanation:

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.