What object does a scientist use to measure liters

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

The missing component to the table to the right or indicated with orange letters complete the table by filling in the corresponding numbers or symbols

Chromosome 17 is made of over million base pairs.