Which of the following is a statement of the first law of thermodynamics? A AE = Efinal - Einitial %3D Ek = - mv2 (C) A negative AH corresponds to an exothermic process. D Energy lost by the system must be gained by the surroundings. (E 1 cal = 4.184 J (exactly)

СH;ОН (1) + Оz (в) — СО2 (s) + H,0 (1) ΔΗ. ræn = -1418 kJ mol How many grams of CO2 were produced if the reaction released 967 kJof heat?

Given: 4AICI3(s) + 302(g) → 2Al,O3(s) + 6C12(g); AH=-529.0 kJ determine AH for the following thermochemical equation. Cl,(3) + Al,O;(s) → AICI,(9) + 02(g) O +88.2 kJ O +264.5 kJ O +176.3 kJ O -176.3 kJ O +529.0 kJ

and 2 Enthalpy #1.30 enoindice pled TT 2010 2D49.bs 22) When 1 mole of Fe2O3(s) reacts with H₂(g) to form Fe(s) and H2O(g) according to the following equation, 98.8 kJ of energy are absorbed. (6 Fe2O3(s) + 3 H2(g) → 2 Fe(s) + 3 H₂O(g) (pp) (20/d4 (pm) $40 D Reaclanis 13:48 SH Products endothermic, A endothermic, B (2) exothermic, A exothermic, B nad W (21 Enthalpy MOMS. Reactants Products (A) (B) Is the reaction endothermic or exothermic, and which of the enthalpy diagrams above represents grow olor and to noin (01 this reaction? SH GH TH A HOMH X HILD 08.10 Page 6 of 8

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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

A chemist carefully measures the amount of heat needed to ralse the temperature of a 1.48 kg sample of C,H,0, from 32.9 °C to 50.0 °C. The experlment 4-8 2 shows that 4.02 x 10* J of heat are needed. What can the chemist report for the molar heat capacity of C,H,0,? Be sure your answer has the correct number of significant digits.

What is the mas of natural gas (CH4) must you burn to emit 276 kJ of heat?

If a system has 225 kcal of work done to it, and releases 5.00 x 102 kJ of heat into its surroundings, what is the change in internal energy (AE or AU) of the system? ΔΕ- kJ