A rock occupies a volume of 20 cm and has a mass of 54 g. Find the density of
this rock.

It takes 945.kj/mol to break a nitrogen-nitrogen triple bond. calculate the maximum wavelength of light for which a nitrogen-nitrogen triple bond could be broken by absorbing a single photon.

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

The boiling point of liquids is very high what does it indicate