Final answer:
The number of molecules in 1.50 moles of fluorine gas is 9.033 x 10^23 molecules.
Step-by-step explanation:
The number of molecules in moles of a substance can be calculated using Avogadro's number, which is 6.022 x 1023 molecules/mol. In this case, we have 1.50 moles of fluorine gas. To find the number of molecules, we multiply the number of moles by Avogadro's number:
Number of molecules = 1.50 mol * 6.022 x 1023 molecules/mol = 9.033 x 1023 molecules