Will mark brainliest if its right

Find the mass, in grams, of 5.00*10^23 molecules of f2

One similarity and one difference between an element and a mixture of elements

Which statement best describes isomers? a. isomers are alcohols that have the same functional group. b. isomers have at least one carbon-carbon double bond. c. isomers have the same molecular formula but different structural properties.