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Sylvanite is a mineral that contains 28.0% gold by mass. how much sylvanite would you need to dig up to obtain 77.0 g of gold? explain how you got your answer and the steps you took. you

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

List and describe the neurological effects of the vocs and other air pollutants,as described by dr.theo colborn