For each of the reactions at constant pressure, determine whether the system does work on the surroundings, the surroundings loes work on the system, or essentially no work is performed. Work done by the system Work done on the system No work done Answer Bank 4 Fe(s) + 3 0,(g) –→ 2 Fe,O,(s) 2 HCI(aq) + CaCO,(s) → H,O(1) + CO,(g) + CaCl,(aq) CCl,(g) + 2 F,(g) → CF,(g) + 2 Cl, (g) 2 CIF;(g) Cl,(g) + 3 F,(g)

A change in a system occurs such that 31.1 J of work is done by the surroundings and 22.4 J of heat flows from the system to the surroundings. What is the change in internal energy of the system?

A chemist measures the enthalpy change AH during the following reaction: 4 Fe(s) + 3 02(g)→2 Fe,O3(s) AH =-320. kJ Use this information to complete the table below. Round each of your answers to the nearest kJ/mol. reaction ΔΗ x10 Fe(s) + 0,6) - Fe,0,(1) O kJ 2Fe,0; (s) – 4Fe(s) + 30, (3) O kJ 4Fe,0, (s) - 8Fe(s) + 60, (3)

Measurements show that the enthalpy of a mixture of gaseous reactants increases by 195.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 69.kJ of work is done on the mixture during the reaction.  Calculate the change in energy of the gas mixture during the reaction. Be sure your answer has the correct number of significant digits. Is the reaction exothermic or endothermic?

A system gains 667 kJ667 kJ of heat, resulting in a change in internal energy of the system equal to +171 kJ.+171 kJ. How much work is done?

A system does 501 kJ of work and loses 216 kJ of heat to the surroundings. What is the change in internal energy, AE, of the system? Note that internal energy is symbolized as AU in some sources. AE = kJ

Consider the change in the internal energy of a system. what is the change in the internal energy, in joules, of a system that does 4.75 x 10^5 J of work, while 3.05 x 10^6J of heat is transferred into the system and 8.25 x 10^6J of heat is transferred from the system to the environment?