Question

A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of . The cylinder is also submerged in a large insulated water bath. (See sketch at right.) From previous experiments, this chemical reaction is known to release of energy. The position of the piston is monitored, and it is determined from this data that the system does of work on the piston during the reaction.

Answer 1

Answer:

It is exothermic in nature.

Explanation:

(1) The reaction is exothermic in nature because it releases heat energy.

(2)  Yes, the temperature of the water go up as the reaction releases heat energy and the temperature cool down as the heat energy is completely removed from the water.

(3)  The piston move in when the pressure in the cylinder decreases and the piston move out when increase of pressure occur.

 (4)  As the outside movement of piston occurs, so we can say that the gas mixture does work on its surroundings.

 (5)   The system released 244 kJ of energy, in which only 150 kJ went into the water, then the difference must be the work done by the system on its surroundings.

 W = (244 - 150) kJ = 94 kJ