Objective Knowledge Check Question 4 Prisc Measurements show that the energy of

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Objective Knowledge Check Question 4 Prisc Measurements show that the energy of a mixture of gaseous reactants decreases by 280. kJ during a certain chemical reaction, which is carried out at a constant pressure. Furthermore, by carefully monitoring the volume change it is determined that 186. kJ of work is done on the mixture during the reaction. Calculate the change in enthalpy of the gas mixture during the reaction. Round your answer to 3 significant digits 2 O exothermic O endothermic Is the reaction exothermic or endothermic? I Don't Know ^ Fr 102 Spra 2018( doc Search the web and Windows

Explanation / Answer

Answer:

The expression for the internal energy change for a process at constant pressure:

H = U + pV

U = H - pV

H = - 280 kJ

W = pV is the work done by the system on the surroundings.

U = - 280 - (-186)

U = -94 kJ

Change in energy = - 94. kJ

The reaction is exothermic because delta H is negative

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