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Assume that the constant-volume heat capacities of carbon dioxide, water, and nitrogen are respectively 45, 35, and 25 J/mol/K.
Calculate the energy released by the decomposition of 1.0 g of 90% hydrogen peroxide solution. Molar mass of hydrogen peroxide = 34.0 g/mol.
For each of the pairs of substances below, choose the one expected to have the greater absolute entropy. Explain your answer.
Neither the temperature nor the pressure remains constant. Otherwise, make any assumptions necessary to solve the problem.
The Substances in the equation about are at equilibrium at pressure P and temperature T. The Equilibrium can be shifted to favor the products.
What quanity of heat is required to raise the temperature of 50.00mL of water from 25.52 to 28.75C? The density of water at this temperature is 0.997 g/mL.
A 5.00 g sample of aluminum pellets (specific heat capacity = 0.89 J/°C · g) and a 10.00 g sample of iron pellets (specific heat capacity = 0.45 J/°C · g)
Calculate the enthalpy change for each of the following cases. 3.00 x 103 L methane gas at 738 torr and 21°C is burned in excess
In a coffee-cup calorimeter, 1.10 g of NH4NO3 is mixed with 76.0 g of water at an initial temperature of 25.00°C.
What would be the final temperature of a solution that contained 50 grams of NH4NO3 dissolved in 125 mL of water.
Calculate the standard heat of formation in kilojoules for the reaction using the following measured heats of formation.
Discuss the difference in magnitude of each of the three steps for dissolution of the two compounds.
Sketch the heating curve of carbon dioxide at atmospheric pressure, starting at -100 C and ending at 30 C.
The normal boiling point of bromine is 58.8 C. Given that the vapor pressure pressure of methanol (sic) is 75.0 torr at 2.5 C.
Calculate the amount of heat that must be absorbed by 10.0 gram of ice at -20 C to convert it to gaseous water at 110 C.
If mixing a sample of compound A with compound X gives a lower melting point than compound X alone, then X and A cannot be identical.
What is the threshold frequency ? 0 of cesium?Note that 1 eV (electron volt)=1.60×10 -19 J. Answer in Hz
Write the balanced molecular equation for the reaction of calcium with molecular oxygen to form calcium oxide.
Limestone(CaCO3) is used to remove acidic pollutants from smokestack flue gases in a sequence of decomposition-combination reactions.
One mole of nitrogen gas confined within a cylinder by a piston is heated from 9.1°C to 883.6°C at 1.30 atm.
A compound containg only carbon and hydrogen is 7.74% H by mass and has a molar mass of 78.1 g/mol.
Calculate the standard enthalpy of formation of gaseous diborane, B2H6, using the following thermochemical information.
The DH of combustion of CH4 is -882kJ/mol.How many grams of water, which has a specific heat of 4.184 J/g-oC can be heated from 30oC to 95oC.
Nitrosyl chloride (NOCl) decomposes at elevated temperatures according to the eqation 2 NOCl(g) 2 NO(g) + Cl2(g)
Some of the butane, C4H10(g), in a 200.0 liter cylinder at 25.0 degrees C is withdrawn and burned at a constant pressure in an excess of air.