Barium can be analyzed by precipitating it as baso4 and determining the mass of the precipitate. when a 0.269 g sample of a barium compound was treated with excess h2so4, 0.0891 g of baso4 formed. what percentage of barium is in the compound?

Percentage of Ba in the compound is 19.5%

Explanation:

According to formula of , 1 molecule of contains 1 molecule of Ba.

So, 1 mol of contains 1 mol of Ba.

Molar mass of = 233.38 g/mol

Number of moles of a compound is ratio of mass to molar mass of the compound.

So, 0.0891 g of = of = 0.000382 moles of

So, moles of Ba present in sample = 0.000382 moles

Molar mass of Ba = 137.33 g/mol

So, mass of Ba in sample =

So, % of Ba in sample = % = 19.5%

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the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.