Final answer:
To calculate the number of molecules of fluorine in a given sample, you can convert the mass of the sample to moles using the molar mass of fluorine and then multiply the number of moles by Avogadro's number. In this case, the number of molecules of fluorine in a 4.55×10^5 g sample is approximately 1.442 x 10^27 molecules.
Step-by-step explanation:
To calculate the number of molecules of fluorine in a given sample, we first need to convert the mass of the sample to moles using the molar mass of fluorine. The molar mass of fluorine (F) is approximately 19.0 g/mol. We can use this number to calculate the number of moles of fluorine in the sample by dividing the mass by the molar mass:
Number of moles = mass / molar mass
Number of moles = 4.55x10^5 g / 19.0 g/mol
Number of moles = 23973.68 mol
Since 1 mole of any substance contains 6.022 x 10^23 molecules, we can calculate the number of molecules of fluorine in the sample by multiplying the number of moles by Avogadro's number:
Number of molecules = number of moles x Avogadro's number
Number of molecules = 23973.68 mol x 6.022 x 10^23 molecules/mol
Number of molecules = 1.442 x 10^27 molecules