The liquid-solid-vapor triple point of a pure substance is Tt=283 K and Pt=0.05 bar. The molar densities of the liquid and solid phases are ?l=22 kmol/m3 and ?s=26 kmol/m3, respectively. The molar enthalpy change of sublimation of the solid at the triple point is ? ?H sv=6.22 kJ/mol and the molar enthalpy change of vaporization of the liquid at the triple point is ? ?H lv=5.65 kJ/mol. Calculate the melting temperature of the solid at a pressure of 10 bar, assuming that the ratio ? ?H sl=?? Vsl is temperature independent, where ? ?H sl is the molar enthalpy change of melting and where ?? Vsl is the molar volume change of melting.

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

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.

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.