You sealed an erlenmeyer flask that was determined to have a volume of 272.2 ml with a stopper. the density of air at 25°c is 0.001185 g/ml. air has an effective molar mass of 28.96 g/mol. what amount of air was sealed in the flask?

The amount of air is 11.1 mmol

Explanation:

Density shows the relation between mass and volume, so you can know the mass which has been sealed in the Erlenmayer.

Density = mass/ volume

Density . volume = mass

0.001185 g/ml . 272.2 ml = 0.322 g

We have the mass now, so the molar weight determinates the mols

Mass/molar weight = mol

0.322g/ 28.96 g/m = 0.0111 mol

To get a better number we can inform on milimols

Mols . 1000 = milimols

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.

passing a magnet thought the

mixture , because iron gets attracted to magnet .