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For the following processes, calculate the change in internal energy of the system and determine whether the process is endothermic or exothermic: (a) A balloon is cooled by removing 0.655 kj of heat. It shrinks on cooling, and the atmosphere does 382 j of work on the balloon. (b) A 100.0-g bar of gold is heated from 25°C to 50°C during which it absorbs 322 j of heat. Assume the volume of the gold bar remains constant. (c) the surroundings do 1.44 kj of work compressing gas in a perfectly insulated cylinder.
Consider a 20.0% (m/v) solution. How can this be written as a conversion factor. * 20.0 g of solute/ 100 mL of solution * 20.0 g of solute/ 80 g of solution * 20.0 g of solute/ 100 g of solution * 20.0 g of solute/ 80 mL of solution
Calculate the enthalpy change for the reaction in kJ/mol HCL. For this problem, assume that the calorimeter loses only a negligible quantity of heat, the total volume of the solution is 100 ml, the density of the solution is 1.0 g/ml, and its spec..
what is the formula for calcium oxalate dihydrate when 100 degree Celsius heat is added?
Glucose, the sugar used by cells of our bodies for energy ahs the molecular formula C6H12O6. How many atoms of CARBON are present in a 3.5 samples of glucose
Give the reaction products of sodium borohydride (followed by acidification) with the following compounds. a) acetone
An unknown acid has a molar mass of 90. g/mol and a mass composition of, 40%-C, 6.7%-H, and 53.3% -O. What is the molecular formula of the acid
what is the boiling point of cyclohexane at 600
A gas mixture contains 75.2% nitrogen and 24.8% krypton by mass. What is the partial pressure of krypton in the mixture if the total pressure is 884mm Hg
You conbine 16.0g of KO2 with the CO2 in 4.00L tank, in which the gas pressure is 1.24 atm at 23.0C. What is the pressure of the oxygen formed if captured in 2.50L flask at 25.0C
At what temperature would the rms speed of atoms in an Ar(g) sample equal that of atoms in a He(g) sample at SATP
A sample gas mixture contains the following quantities of 3 gases. The sample gas a volume of 2.50 L and temperature of 16.6 C. what is the partial pressure for each gas in mmHg
1.500 g of Mg(s) was combined with 125.0 mL of 1.0 M HCl. The initial temperature was 25.0oC and the final temperature was 72.3oC.
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