All three molecules of the illustration entitled "pentane isomers: "

have the same chemical formula
contain the same number of carbon atoms
are isomers

1. have the same chemical formula

2. contain the same number of carbon atoms

3. are isomers

Explanation:

All 3 statements are correct.

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".