A sample of ammonia (NH3) releases 5.66 kJ of heat as it solidifies at its melting point. What is the mass of the sample? DHsolid = – 5.66 kJ/mol

Three alkali metals in group 1 are a. calcium, strontium, barium b. boron, aluminum, gallium c. sodium, potassium, rubidium d. fluorine, iodine, chlorine

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

What is the mass of oxygen gas is consumed in a reaction that produces 4.60mol so2