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? AE = kJ

In a popular television series, the two characters use thermite to assist with breaking into a chemical storage facility because the reaction between aluminum and iron(III) oxide produces a tremendous amount of heat. If they began with 10.0 g of Al, how many kJ of heat would be released? 29. 2 Al(s) + Fe,O3(s) → Al,O;(s) + 2 Fe(s) AH = -852 kJ 158 kJ A) B) 236 kJ 472 kJ D) None of the above

When 6.54 grams of Zn is placed in 500.0 mL of 1.00 M CuSO4(aq) in a coffee cup calorimeter, it reacts completely to displace copper. The temperature of the solution rises from 20.0˚C to 30.4˚C. Assume the coffee cup itself gains no heat and that the solution has the same density (1.00 g/mL) and specific heat (4.184 J/g˚C) as pure water. (a) How much heat does the solution gain during this reaction? (in J)

A piece of chromium metal with a mass of 24.50 g is heated in boiling water to 98.3 °C and then dropped into a coffee-cup calorimeter containing 82.3 g of water at 23.4 °C. When thermal equilibrium is reached, the final temperature is 25.7 °C. Calculate the specific heat capacity of chromium. (The specific heat capacity of liquid water is 4.184 J/g ⋅ K.)

Gasoline and ethanol can both be used as a fuel source in cars.  However, the potential chemical energy is not equal.  A fuel mixture uses 85% ethanol and 15% gasoline called E85.  Assume a car is rated at 28.0 miles/gallon using gasoline only at $3.50/gallon and 22.5 miles/gallon using E85 at $2.85/gallon.  How much would it cost for using each fuel to drive 500.0 miles?

Air in an inflated balloon (system) is cooled and loses 525. J of heat. The surroundings also compress it, doing  91.7 J of work. What is the change in internal energy for the system?

Which statement is true of the internal energy of the system and its surroundings following a process in which AE sys = +25 kJ? The system loses 25 kJ of energy and the surroundings gain 25 kJ of energy. The system gains 25 kJ of energy and the surroundings lose 25 kJ of energy. The system and surroundings both lose 25 kJ of energy. The system and surroundings both gain 25 kJ of energy.