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 1 atm. The cylinder is also submerged in a large insulated water bath. (See sketch at right.) The temperature of the water bath is monitored, and it is determined from this data that 192 kJ of heat flows out of the system during the reaction. The position of the piston is also monitored, and it is determined from this data that the system does 110. KJ of work on the piston during the reaction. Is the reaction exothermic or endothermic? exothermic endothermic x down ? 5 Does the temperature of the water bath go up or down? O neither Does the piston move in or out? out neither Does the reaction absorb or release energy? release How much energy does the reaction tortor release Round your answer to 3 significant digits.

Answer 1

Answer

Given:Heat flows out from the gaseous mixture present inside the cylinder i.e giving us a value -q

The given reaction is exothermic reaction since the given information say that energy flow out of the system .

The chemical of gaseous molecule occurs in the given system is exothermic which release energy and hence the temperature of the water bath will goes up.

And the given reaction is exothermic which releases energy hence piston present inside the cylinder will move out.H

According to First low of thermodynamic, the energy given absorbed and reaction at constant pressure is equal to the change change in enthalpy of the system is equal to the heat.

  

ΔΗ = q

And hence heat will release   

ΔΗ =-q

ΔΗ =-q = -192KJ