Which element is likely to have the highest thermal conductivity

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)?

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

How do i turn 2 s into one in the products