Sylvanite is a mineral that contains 28.0% gold by mass. how much sylvanite would you need to dig up to obtain 44.0g of gold?

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

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

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver