If 15 grams of sodium chlorate, NaClO3, decomposes in a 20 L container at 53 °C, at what pressure in atmospheres will O2 gas be produced?

An aqueous solution of calcium hydroxide is standardized by titration with a 0.120 m solution of hydrobromic acid. if 16.5 ml of base are required to neutralize 27.5 ml of the acid, what is the molarity of the calcium hydroxide solution?

How do you know when a chemical reaction has occurred

What is the enthalpy of combustion (per mole) of c4h10 (g)? –2,657.5 kj/mol –5315.0 kj/mol –509.7 kj/mol –254.8 kj/mol