Why a preservative not added when preparing non aqueous drug solution?

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

What type of energy do chemical bonds have? what type of energy is it converted to during chemical reactions? question 15 options: chemical bonds have kinetic energy, which is converted to potential energy during chemical reactions. chemical bonds have electric energy, which is converted to potential energy during chemical reactions. chemical bonds have heat energy, which is converted to kinetic energy during chemical reactions. chemical bonds have potential energy, which is converted to heat energy during chemical reactions.

What is the molar mass of potassium nitrate, kno3