How can i find the mass of something dealing with liters and density of kilograms per liter?

How many grams of aluminum will there be in 98g of al2o3?

Consider the following multistep reaction: a b→ab(slow) a ab→a2b(fast)−−−−−−−−−−−−−−−−− 2a b→a2b(overall) based on this mechanism, determine the rate law for the overall reaction. express your answer in standard masteringchemistry format. for example, if the rate law is k[a]3[b]2 type k*[a]^3*[b]^2

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