Answer: the molecular formula is C10H20O
Explanation:Please see attachment for explanation
Answer:
e. None of these.
Explanation:
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In this case, since the Henry's law is defined in terms of pressure, henry's constant and pressure, as shown below:

Whereas C is the concentration, KH the Henry's constant and P the pressure, we infer that the concentration of a gas solution is directly proportional to the pressure, which is not the group choices, therefore, the answer is e. None of these.
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Answer:
Because if you use pen, your chromatography will separate also the colors of the pen and not just your sample.
Explanation:
The pencil since is carbon as simple element, is solid and is not dissolved in solvents like commonly are used in paper chromatography, it will not interrupt the separation of the compounds in your mixture, otherwise, your results will be confuse because you are not sure if the spots that you observe is due to the ink pen or due to the mixture that you want to separate.
It would be.. sand, slit, clay.