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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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(SHOW WORK) A system delivers 1245 J of heat while the surroundings perform 1860 J of work on it. Calculate ΔE in J.
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- 5.00 g of potassium hydroxide (molar mass = 56.1 g/mol) dissolves in 100.0 g of water and the temperature of the solution increases by 1.60oC. Calculate ΔH for the reaction in kJ/mol of KOH .The specific heat capacity of the solution is 4.18 J/goC ( Hint: the mass of the solution is 105g) (Hint #2: is this + or -?) Your answer should be in kJ/mol and have 3 sig figsarrow_forwardA gas is compressed from 2.31 L down to 1.12 L at a pressure of 1.13 atm. If 51 J of heat is given off in the process, what is the change in the internal energy ΔU of the gas?arrow_forwardThe temperature of a 15-g sample of lead metal increases from 22 °C to 37 °C upon the addition of 29.0 J of heat. The specific heat capacity of the lead is J/g-K.arrow_forward
- A chemist carefully measures the amount of heat needed to raise the temperature of a 0.81kg sample of C4H6O2 from 31.4c to 49.6c. The experiment shows that 2.48*10^4 J of heat are needed. what can the chemist report for the molar heat capacity of C4H6O2 ? Round your answer to 2 sig figs.arrow_forwardWhat is the change in internal energy for a system if the system absorbs 322 kJ of heat and has 750.0 kJ of work done on the system?arrow_forwardAir 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?arrow_forward
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