Why is displacement useful in finding the density of an irregularly shaped object?

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.

How can parts of a solution be separated by chromatography?