What is the density of an object that has a mass of 21 g and a volume of 9 ml?

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball

The boiling point of propanoic acid is higher than that of 1-butanol because: propanoic acid has a higher molecular weight than 1-butanol. propanoic acid is more soluble in water than 1-butanol. propanoic acid is a better hydrogen bond donor than 1-butanol. propanoic acid forms hydrogen bonded dimers and 1-butanol does not. 1-butanol forms hydrogen bonded dimers and propanoic acid does not.

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !