What is the change in internal energy for a system if the system absorbs 537 kJ of heat and does 1609 kJ of work? Select one: a. 1072 kJ b. 1.07 x 10^3 kJ c. 428 kJ d. –1.07 x 10^3 kJ e. -536 kJ f. none of these g. -428 kJ h. -1072 kJ i. 536 kJ j. 537 kJ

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A chemist measures the energy change AH during the following reaction: Cl₂(g) + H₂(g) → 2 HC1 (g) AH=184. kJ Use the information to answer the following questions. endothermic. This reaction is... 0 exothermic. Suppose 28.0 g of Cl₂ react. Yes, absorbed. Yes, released. Will any heat be released or absorbed? No. If you said heat will be released or absorbed in the second part of this question, calculate how much heat will be released or absorbed. Round your answer to 3 significant digits. ☐kJ x10 X ?

3. A certain quantity of nitrous oxide (laughing gas) expands, doing 144 J of work. At the same time, it absorbs 299 J of heat from the surroundings. Which ONE represents the change in internal energy of the nitrous oxide? A. B. C. D. E. -443 J -155 J OJ 155 J 443 J

Consider the following reaction carried out under constant pressure         5Cl2(g) + 2P(s) → 2PCl5(g)         Δ Hrxn = -749.8 kJCalculate the heat associated with the complete reaction of 84.0 g of Cl2 with 20.6 g of P. -6.15×102 kJ -1.78×102 kJ -4.99×102 kJ -8.88×102 kJ -2.50×102 kJ

14) What is the change in internal energy of a system if the system evolves 280 cal of heat and has 1.25 kJ of work done on it? B) 79.6 J C) -281.3 J D) 281.3 J E) 1169.1 J A) -79.6 J

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If a system has a change in energy of 400 J and produces 200 J of work, how much heat was added to the system? O 800 J O200 J O 600 J O 200 J ODO

Consider these reactions: Reaction 1: H2 (g) + Cl2 (g) → 2HC1(g) AH = -184.6 kJ Reaction 2: 20F2 (9) → 02 (9) + 2 F2 (9) AH= -49.4 kJ Reaction 3: N2 (g) + 202(g) → 2NO2(g) AH=+66.4 kJ Use Reaction 2. How much energy (in kJ) is released when 61.0 g of oxygen difluoride decomposes? Answer: - kJ (enter a positive value)