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Calculate the change in internal energy of the system and determine whether the process is endothermic or exothermic: a) a balloon is heated by adding 850J of heat. It expands, doing 382J of work on the atmosphere. b) a 50-g sample of water is cooled from 30 degrees Celsius to 15 degrees Celsius, thereby losing approximately 3140J of heat. c) A chemical reaction releases 6.47 kJ of heat and does no work on the surroundings.
What types of limitations and obstacles must any plausible origin of life scenario overcome, and why did Crick believe life couldn't have formed on Earth?
Determine the [H+] and the pH of a buffer containing 0.20 M acetic acid and 0.10 M sodium acetate. 2. Calculate the percent dissociation of acetic acid in this solution
The mass percent of a three component gas sample is 58.0% C2H4O2, 14.6% NH3 and 27.4% CH2O. Calculate the partial pressure (atm) of CH2O if the total pressure of the sample is 0.340 atm.
Determine the molality and molarity of a solution made by dissolving 445 g of NaBr in 2600 ml of water ?
What is the molecular weigh of acetic acid that will form 2 moles of CO2 assuming complete combustion.
A sample of gas has an initial volume of 3.0 L at a pressure of 747 mmHg,If the volume of the gas is increased to 3.4 L , what will the pressure be?
Evaporation and its Effects on PCP and Cresol, We are asked to explain the phenomena of how 1 gram of liquid water at 35 degrees C
find the molarity of 0.5 grams of sodium chloride is dissolved to make 0.05 ml of solution
How many liters of oxygen collected over H2O and measured at 27 degrees Celsius and 745.0 mm Hg can be prepared by decomposing 4.421 grams of gold (III) oxide? The vapor pressure of H2O at 27 degrees Celsius is 26.7 mm Hg.
Calculate the molarity of a solution of glycerol made by dissolving 69.000 mL glycerol at 15 degrees C in enough water to make 260.00 mL of solution
A soft drink contains 35 mg. of sodium in 315g. of H2O. What is the concentration of sodium in the soft drink in mass percent?
If 25.6 L of NO2 forms, measured at 35°C and 605 mm Hg, what is the percent yield?
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