How many carbon atoms are there in 1.00 mol of c2h6?

Ab c or d ? i’m not sure what the answer is

The density of the solid phase of a substance is 0.90 g/cm3 and the density of the liquid phase is 1.0 g/cm3. a large increase in pressure will a. lower the freezing point b. raise the freezing point c. lower the boiling point d. raise the triple point e. lower the triple point

How can parts of a solution be separated by chromatography?