Write the quantities 3 × 10^-4 cm and 3 × 10^4 km in ordinary notation

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?

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?