Sulfur and oxygen react in a combination reaction to produce sulfur trioxide, an environmental pollutant: 2S(s) + 3O2(g) → 2SO3(g) In a particular experiment, the reaction of 1.0 g S with 1.0 g O2 produced 0.80 g of SO3. The % yield in this experiment is .

54\%

Explanation:

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In this case, the first step is to identify the limiting reagent by considering the shown below procedure in terms of the reacting sulfur:

Thus, since 1.0 g of oxygen would consume 0.0185 mole of sulfur and there are 0.03125 mole available, oxygen is the limiting reagent, in such a way, the theoretical yield turns out:

Finally, the percent yield:

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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.