25. A sample of helium gas occupies 120 mL at 71 mmHg. For a gas sample at constant temperature,

determine the volume of helium at 45 mmHg. Show your work.

26.  If one strand of a DNA double helix has the sequence ATCGATCGAT, what is the sequence of the other DNA strand? 

27. Polyethylene is a polymer found in many applications, including packaging for fruit and vegetables.  Discuss the structural differences between (1) polyethylene and (2) polypropylene and (3) polyvinylchloride and how the structure impacts their commercial use

28. Tantalum (Ta), with a mass number of 185 and an atomic number of 73, decays by beta emission.  Identify the product of the nuclear reaction by providing its atomic symbol, mass number  and atomic number 

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