Chemistry, 31.07.2019 13:30 hanjonez

The molecular formula for glucose is c 6 h 12 o 6 . what would be the molecular formula for a polymer made by linking ten glucose molecules together by dehydration reactions?

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Answer is: the molecular formula for a glucose polymer is C₆₀H₁₀₂O₅₁.
For every link one molecule of water is released, so if we have ten molecules of glucose, there is nine links and nine molecules of water (H₂O) are released.
molecular formula = 10·C₆H₁₂O₆ - 9·H₂O.
carbon atoms = 10 · 6 = 60.
hydrogen atoms = 10 · 12 - 9 · 2 = 102.
oxygen atoms = 10 · 6 - 9 · 1 = 51.

Answer from: Quest

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

explanation

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 $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ 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 $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

Answer from: Quest

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

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