Question

You perform three different reactions at constant pressure and note the heat associated with the three reactions are equal. Reaction 1 produces gas, reaction 2 consumes it and reaction 3 has no gaseous substances as reactants or products. Which statement below is true? Note: Greatest refers to the value, not the magnitude, so -2 is greater than -5 and 1 is greater than both. Select one: a. The internal energy change is greatest for the reaction producing gas and smallest for the reaction consuming gas. b. The internal energy change of the three reactions are equal. X Remember that changing the volume, such as by changing the number of moles of gas, can result in work being done which effects the internal energy. c. The internal energy change is greater for the reactions producing and consuming gas than the reaction which does not involve gas. d. The internal energy change for a reaction is a complicated function and cannot be compared using the information available in this question. e. The internal energy change is greatest for the reaction consuming gas and smallest for the reaction producing gas.

Answer 1

Reastior 1- froducs gas = tve Ang - no-otchange in mola e 3aeons pa Campauds Dng gcan aductgaseos heaututs 8as is heing frodued Ang-tve DH B0+DngRT tve

Reauton 2- Cosuns Ang gaseus foratuct- td Fve AHE BU+Dny RT ng RT ΔUΣΔΗ AH Reaubo 3 No gas ratant Aocclact L Ang AH=AU+ORT AH-AU Heat asaiated witk 3 suactiou heautior are equal &x fas taken Joace at constant pressiure ie, p HSane arall 30 Now onfering , Intnal energy change is gheatuk in the Reaution-2 ohich is LOun ga and Amallet Por Reaction-1 Lehich is freducig gas Oplan-e Corsut