What is the molecular formula compound with the empirical formula P205 and gram molecular formula of 284 grams?

Molecular formula = P₄O₁₀

Explanation:

Given data:

Empirical formula = P₂O₅

Gram molecular mass = 284 g/mol

Molecular formula = ?

Solution:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula mass  = 2 ×31 + 5× 16 = 142

n = 284 / 142

n = 2

Molecular formula = n (empirical formula)

Molecular formula =2 (P₂O₅)

Molecular formula = P₄O₁₀

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.