Is 14k gold heterogeneous or homogeneous?

What is the molarity of a solution that is prepared by adding 57.1 g of toluene (c 7 h 8 ) (density = 0.867 g/ml) to a 250 ml volumetric flask, and then filling to the mark with benzene (c 6 h 6 ) (density = 0.876 g/ml)?

How many atoms are there in 5.70 mol of mg

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