Final answer:
In 5 molecules of isopropyl alcohol, C3H8O, there are 40 hydrogen atoms, as there are 8 hydrogen atoms per molecule and the number of molecules is 5.
Step-by-step explanation:
The question asks how many hydrogen atoms are in 5 molecules of isopropyl alcohol, C3H8O. The molecular formula for isopropyl alcohol indicates that there are 8 hydrogen atoms per molecule. To find the total number of hydrogen atoms in 5 molecules, we multiply the number of hydrogen atoms in one molecule by the number of molecules:
8 hydrogen atoms/molecule × 5 molecules = 40 hydrogen atoms
So, the correct answer would be 40 hydrogen atoms in 5 molecules of isopropyl alcohol, none of the options provided are correct.