I NEED HELP, THANKS! Using the Ideal Gas Law, PV = nRT, where R = 0.0821 L atm/mol K, calculate the volume in liters of oxygen produced by the catalytic decomposition of 25.5 g potassium chlorate according to the following reaction. The oxygen is collected at 2.22 atm and 25.44°C. Express your answer to the correct number of significant figures.

Explanation:

We will need a balanced chemical equation with molar masses, so, let's gather all the information in one place.

Mᵣ:       122.55

           2KClO₃ ⟶ 2KCl + 3O₂

m/g:       25.5

(a) Moles of KClO₃

(b) Moles of O₂

The molar ratio is 3 mol O₂:2 mol KClO₃

(c) Volume of O₂

We can use the Ideal Gas Law to calculate the volume of hydrogen.

pV = nRT

T = (25.44 + 273.15) K =  298.59 K

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.