Is the density of hexane (d = 0.659 g/mL at 20° C) the same, higher, or lower at 20° than at 40° C?

Question

Thank you in advance!

Answer 1

This is something you should be able to determine yourself.

You know that hexane and everything else occupies more space as the temperature rises. This means that 1 L of Hexane at 20 C is larger than 1 L at 40 C.

If you take 1 L of hexane at 20 deg C and weigh it you will find it weighs 659 g. If you raise the temp to 40 deg C the hexane still weighs 659 g but it takes up more space than 1 L.

Now with the weight (g) the same at both temperatures and the volume greater at 40 C will the density (grams / L) be higher or lower? You can do this!