use the second image as reference for standards Standard molar enthalpies and temperatures for phase changes of waterPhaseChangeFusionFreezingVaporizationCondensationTransition0°C0°C100°C100°CTemperatureΔΗ6009.5AHvap4.07 × 10*AHcond-4.07 × 10*AH (J/mol)AHfreeze-6009.5Specific Heat, c(Jg'K*)Molar Heat Capacity, C,(J mol1 K^1)SubstanceAl(s)0.90024.3Cu(s)0.38524.5H¿O(s)2.0937.7H,O(()4.1875.3H;O(g)2.0336.4 If a machine does 75.44 kJ of work after an input of 97.31 kJ of heat, what is the change in internal energy for the machine?Round your answer to 2 decimal places.

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Living By Chemistry: First Edition Textbook

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ChapterU5: Fire: Energy , Thermodynamics, And Oxidation-reduction

Section: Chapter Questions

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A 45-g aluminum spoon (specific heat 0.88 J/g C) at 24 C is placed in 180 mL (180 g) of coffee at 85 C and the temperature of the two become equal. (a) What is the final temperature when the two become equal? Assume that coffee has the same specific heat as water. (b) The first time a student solved this problem she got an answer of 88 C. Explain why this is clearly an incorrect answer.
The temperature of the cooling water as it leaves the hot engine of an automobile is 240 F. After it passes through the radiator it has a temperature of 175 F. Calculate the amount of heat transferred from the engine to the surroundings by one gallon of water with a specific heat of 4.184 J/g oC.
An aluminum kettle weighs 1.05 kg. (a) What is the heat capacity of the kettle? (b) How much heat is required to increase the temperature of this kettle from 23.0 C to 99.0 C? (c) How much heat is required to heat this kettle from 23.0 C to 99.0 C if it contains 1.25 L of water (density of 0.997 g/mL and a specific heat of 4.184 J/g C)?
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Find (a) E when a gas absorbs 18 J of heat and has 13 J of work done on it. (b) q when 72 J of work are done on a system and its energy is increased by 61 J.
Swimming Pool A swimming pool measuring 20.0m12.5m is filled with water to a depth of 3.75m. If the initial temperature is 18.4°C, how much heatmust be added to the water to raise its temperature to29.0°C? Assume that the density of water is 1.000 g/mL.
A block of aluminum and a block of iron, both having the same mass, are removed from a freezer and placed outside on a warm day. When the same quantity of heat has flowed into each block, which block will be warmer? Assume that neither block has yet reached the outside temperature. (See Table 6.1 for the specific heats of the metals.)
The complete combustion of acetylene, C2H2(g), produces 1300. kJ of energy per mole of acetylene consumed. How many grams of acetylene must be burned to produce enough heat to raise the temperature of 1.00 gal water by 10.0c if the process is 80.0% efficient? Assume the density of water is 1.00 g/cm3
In the “Chemistry in Focus” segment Firewalking: Magic or Science?, it is claimed that one reason people can walk on hot coals is that human tissue is mainly composed of water. Because of this, a large amount of heat must be transferred from the coals to change the temperature of the feet significantly. How much heat must be transferred to 100.0 g of water to change its temperature by 35 °C?
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If a machine does 75.44 kJ of work after an input of 97.31 kJ of heat, what is the change in internal energy for the machine? Round your answer to 2 decimal places.