This was on an ACT Practice Test and I’m not sure how to solve it.
If there are 8 × 10^12 hydrogen molecules in a volume of 4 × 10^4 cubic centimeters, what is the average number of hydrogen molecules per cubic centimeter?
The answer is 2x10^8.
Hi! You just divide the number of molecules by the total volume. If you learned dimensional analysis in chemistry, that would make it easier to understand:
8 x 10^12 molecules / 1 X 1/ 4 X 10^4 cucm = 2 X 10^8 molecules/cucm