ich represents the definition of pressure A) volume x force B) volume/density C) force/area D) moles/volume E) temperature x area Determine the specific heat capacity of a newly developed alloy of nickel metal, given the following calorimetry results. When a 85.66 g sample of the alloy, initially at 90.0°C, is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 10.0°C, the alloy and water reach 25.0°C at equilibrium. (ASsume no heat losses, the density of water is 1.00 g/mL and the specific heat capacity of water is 4.18 J/g °C) A) 0.271 J/g C B) 4.18 J/g °C C) 0.678 J/g °C D) 0.563 J/g °C E) 0.951 J/g °C 8) What are the spectator ions in the reaction of HCl (aq) with AgNO3 (aq)? A) there are no spectator ions in this reaction B) H and N03- (77 DELL

ich represents the definition of pressure A) volume x force B) volume/density C) force/area D) moles/volume E) temperature x area Determine the specific heat capacity of a newly developed alloy of nickel metal, given the following calorimetry results. When a 85.66 g sample of the alloy, initially at 90.0°C, is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 10.0°C, the alloy and water reach 25.0°C at equilibrium. (ASsume no heat losses, the density of water is 1.00 g/mL and the specific heat capacity of water is 4.18 J/g °C) A) 0.271 J/g C B) 4.18 J/g °C C) 0.678 J/g °C D) 0.563 J/g °C E) 0.951 J/g °C 8) What are the spectator ions in the reaction of HCl (aq) with AgNO3 (aq)? A) there are no spectator ions in this reaction B) H and N03- (77 DELL

Chemistry & Chemical Reactivity

9th Edition

ISBN:9781133949640

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter5: Principles Of Chemical Reactivity: Energy And Chemical Reactions

Section: Chapter Questions

Problem 39PS: A piece of titanium metal with a mass of 20.8 g is heated in boiling water to 99.5 C and then...

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9.50 When a 13.0-g sample of NaOH(s) dissolves in 400.0 mL of water in a coffee cup calorimeter, the temperature of the water changes from 22.6°C to 30.7C Assuming that the specific heat capacity of the solution is the same as for water, calculate (a) the heat transfer from system to surroundings and (b) H for the reaction NaOH(s)Na+(aq)+OH(aq)
The reaction SO3(g)+H2O(l)H2SO4(aq) is the last step in the commercial production of sulfuric acid. The enthalpy change for this reaction is 227 kJ. In designing a sulfuric acid plant, is it necessary to provide for heating or cooling of the reaction mixture? Explain.
A sample of 0.562 g of carbon is burned in oxygen in a bomb calorimeter, producing carbon dioxide. Assume both the reactants and products are under standard state conditions, and that the heat released is directly proportional to the enthalpy of combustion of graphite. The temperature of the calorimeter increases from 26.74 C to 27.93 C. What is the heat capacity of the calorimeter and its contents?
What is the difference between the enthalpy of reaction and the enthalpy of formation? For what chemical reaction(s) are the two quantities the same?
A sample of nickel is heated to 99.8C and placed in a coffee-cup calorimeter containing 150.0 g water at 23.5C. After the metal cools, the final temperature of metal and water mixture is 25.0C. If the specific heat capacity of nickel is 0.444 J/C g, what mass of nickel was originally heated? Assume no heat loss to the surroundings.
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) are heated to 100.0C. The mixture of hot iron and aluminum is then dropped into 97.3 g water at 22.0C. Calculate the final temperature of the metal and water mixture, assuming no heat loss to the surroundings.
A piece of titanium metal with a mass of 20.8 g is heated in boiling water to 99.5 C and then dropped into a coffee-cup calorimeter containing 75.0 g of water at 21.7 C. When thermal equilibrium is reached, the final temperature is 24.3 C. Calculate the specific heat capacity of titanium.
When 50.0 g of 0.200 M NaCl(aq) at 24.1 C is added to 100.0 g of 0.100 M AgNO3(aq) at 24.1 C in a calorimeter, the temperature increases to 25.2 C as AgCl(s) forms. Assuming the specific heat of the solution and products is 4.20 J/g C, calculate the approximate amount of heat in joules produced.
Microwave ovens convert radiation to energy. A microwave oven uses radiation with a wavelength of 12.5 cm. Assuming that all the energy from the radiation is converted to heat without loss, how many moles of photons are required to raise the temperature of a cup of water (350.0 g, specific heat =4.18J/gC) from 23.0C to 99.0C?
Ammonium nitrate is an oxidizing agent and can give rise to explosive mixtures. A mixture of 2.00 mol of powdered aluminum and 3.00 mol of ammonium nitrate crystals reacts exothermically yielding nitrogen gas, water vapor, and aluminum oxide. How many grams of the mixture are required to provide 245 kJ of heat? See Appendix C for data.
Explain why absolute enthalpies and energies cannot be measured, and only changes can be determined.