Can anyone me with my chemistry question?

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)?

The most efficient way to establish the best possible economizer position is to measure

Which substances have the lowest melting points: ionic covalent, or metallic