Consider the balanced equation below. 3fe+4h_2o -> fe_3o_4+4h_2 what is the mole ratio of fe_3o_4to fe? a. 1: 3 b. 1: 4 c. 3: 1 d. 4: 3

A. 1:3

The equation shows that 1 mol Fe_3_O4 ≡ 3 mol Fe.

∴ The mole ratio is Fe_3_O4:Fe = 1:3.

“B. 1:4” is incorrect. It is the mole ratio of Fe_3O_4:H_2O and of Fe_3O_4:H_2.

“C: 3:1” is incorrect. It is the mole ratio of Fe:Fe_3O_4.

“D: 4:3” is incorrect. It is the mole ratio of H_2O:Fe and of H_2:Fe.

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.

it is the most commonly accepted one