Excess amount of hydrochloric acid is added to 2.5 g of pure zinc. The gas produced is collected over water in a gas cylinder at 28 °C and 100.0 kNm2. Calculate : a) the number of mole of gas produced in the reaction. b) the volume of gas collected in the cylinder.

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules